* signed safe math
* fix lint errors
* refactor overflow checks and add descriptions
* remove incorrect description
* add test for reversed arguments in multiplication test
* fix power operator
* improve multiplication test descriptions
* Update SafeMath.test.js
* add feature to changelog
* Added PausableCrowdsale contract
* Changed inheritance order to prevent "Linearization of inheritance graph impossible" error
* Updated mock PausableCrowdsaleImpl to new constructor syntax
* Broke function definition to multiple lines
Comply with new max line length
* Rename events to past-tense in PausableCrowdsale test
* Removed should.be.fullfilled from PausableCrowdsale tests
* Change import assertRevert to require in PausableCrowdsale tests
* Remove dependency on chai-as-promised and added BigNumber support in PausableCrowdsale tests
* reindent solidity with 4 spaces
* add missing view modifier in _preValidatePurchase
* convert assertRevert to new shoulFail helper
* add new setup helper
* use expectEvent
* convert to assert to chai should style
* add description to beforeEach blocks
* extract common step to beforeEach
* improve documentation
* revert inheritance error
* move PausableCrowdsale into crowdsale/validation
* make documentation more specific
* put whitespace in line with convention
* improve test suite account names
* undo beforeEach descriptions
* simplify tests
* fix transaction senders to be the anyone account
* make transaction senders more explicit
* remove mocha only
* Now only swapping when needed.
* Removed _addTokenTo and _removeTokenFrom
* Removed removeTokenFrom test.
* Added tests for ERC721 _mint and _burn
* _burn now uses the same swap and pop mechanism as _removeFromOwner
* Gas optimization on burn
* Added WhitelisterRole.
* Added WhitelisteeRole and WhitelistedCrowdsale.
* Added WhitelistedCrowdsale tests.
* Whitelisters can now remove Whitelistees.
* PublicRole.behavior now supports a manager account, added Whitelistee tests.
* Rephrased tests, added test for whitelistees doing invalid purchases.
* Fixed linter error.
* Fixed typos
Co-Authored-By: nventuro <nicolas.venturo@gmail.com>
* Working around JS quirks
Co-Authored-By: nventuro <nicolas.venturo@gmail.com>
* Update PublicRole.behavior.js
* Renamed WhitelisteeRole to WhitelistedRole.
* Renamed WhitelistedCrowdsale to WhitelistCrowdsale.
* Now using the new test helper.
* Added basic documentation.
* Added inTransaction tests.
* Added expectEvent.inConstructor.
* Changed inTransaction, removed decodeLogs.
* Flipped comparison to improve the error message.
* Improved expectEvent tests.
* Migrated tests to use expectEvent.
* Added roles constructor tests.
* Fixed linter errors.
* Made lodash a dev dependency.
* Added more inLogs tests.
* Update expectEvent.test.js
* Removed lodash.
* Moved role constructor tests to public role behavior.
* Revert "Flipped comparison to improve the error message."
This reverts commit 438c57833d.
* Replaced chai-as-promised with shouldFail.
* Add Arrays library with unit tests (#1209)
* prepared due to snapshot token requirements
* add library with method to find upper bound
* add unit test for basic and edge cases
* Imporove documentation for Arrays library
Simplify Arrays.test.js to use short arrays as test date
* Added comment for uint256 mid variable.
* Explaned why uint256 mid variable calculated as Math.average is safe to use as index of array.
* separate part of ERC721Mintable into ERC721MetadataMintable
* remove mint and burn from 721 tests
* Fixed linter error.
* fix ERC721 mint tests
* Minor fixes.
* Role tests (#1228)
* Moved RBAC tests to access.
* Added Roles.addMany and tests.
* Fixed linter error.
* Now using uint256 indexes.
* Removed RBAC tokens (#1229)
* Deleted RBACCappedTokenMock.
* Removed RBACMintableToken.
* Removed RBACMintableToken from the MintedCrowdsale tests.
* Roles can now be transfered. (#1235)
* Roles can now be transfered.
* Now explicitly checking support for the null address.
* Now rejecting transfer to a role-haver.
* Added renounce, roles can no longer be transfered to 0.
* Fixed linter errors.
* Fixed a Roles test.
* True Ownership (#1247)
* Added barebones Secondary.
* Added transferPrimary
* Escrow is now Secondary instead of Ownable.
* Now reverting on transfers to 0.
* The Secondary's primary is now private.
* Improve encapsulation on ERC165
* Improve encapsulation on ERC20
* Improve encapsulation on ERC721
* Add tests, use standard getters
* fix tests
* Fix lint
* MintableToken using Roles (#1236)
* Minor test style improvements (#1219)
* Changed .eq to .equal
* Changed equal(bool) to .to.be.bool
* Changed be.bool to equal(bool), disallowed unused expressions.
* Add ERC165Query library (#1086)
* Add ERC165Query library
* Address PR Comments
* Add tests and mocks from #1024 and refactor code slightly
* Fix javascript and solidity linting errors
* Split supportsInterface into three methods as discussed in #1086
* Change InterfaceId_ERC165 comment to match style in the rest of the repo
* Fix max-len lint issue on ERC165Checker.sol
* Conditionally ignore the asserts during solidity-coverage test
* Switch to abi.encodeWithSelector and add test for account addresses
* Switch to supportsInterfaces API as suggested by @frangio
* Adding ERC165InterfacesSupported.sol
* Fix style issues
* Add test for supportsInterfaces returning false
* Add ERC165Checker.sol newline
* feat: fix coverage implementation
* fix: solidity linting error
* fix: revert to using boolean tests instead of require statements
* fix: make supportsERC165Interface private again
* rename SupportsInterfaceWithLookupMock to avoid name clashing
* Added mint and burn tests for zero amounts. (#1230)
* Changed .eq to .equal. (#1231)
* ERC721 pausable token (#1154)
* ERC721 pausable token
* Reuse of ERC721 Basic behavior for Pausable, split view checks in paused state & style fixes
* [~] paused token behavior
* Add some detail to releasing steps (#1190)
* add note about pulling upstream changes to release branch
* add comment about upstream changes in merging section
* Increase test coverage (#1237)
* Fixed a SplitPayment test
* Deleted unnecessary function.
* Improved PostDeliveryCrowdsale tests.
* Improved RefundableCrowdsale tests.
* Improved MintedCrowdsale tests.
* Improved IncreasingPriceCrowdsale tests.
* Fixed a CappedCrowdsale test.
* Improved TimedCrowdsale tests.
* Improved descriptions of added tests.
* ci: trigger docs update on tag (#1186)
* MintableToken now uses Roles.
* Fixed FinalizableCrowdsale test.
* Roles can now be transfered.
* Fixed tests related to MintableToken.
* Removed Roles.check.
* Renamed transferMintPermission.
* Moved MinterRole
* Fixed RBAC.
* Adressed review comments.
* Addressed review comments
* Fixed linter errors.
* Added Events tests of Pausable contract (#1207)
* Fixed roles tests.
* Rename events to past-tense (#1181)
* fix: refactor sign.js and related tests (#1243)
* fix: refactor sign.js and related tests
* fix: remove unused dep
* fix: update package.json correctly
* Added "_" sufix to internal variables (#1171)
* Added PublicRole test.
* Fixed crowdsale tests.
* Rename ERC interfaces to I prefix (#1252)
* rename ERC20 to IERC20
* move ERC20.sol to IERC20.sol
* rename StandardToken to ERC20
* rename StandardTokenMock to ERC20Mock
* move StandardToken.sol to ERC20.sol, likewise test and mock files
* rename MintableToken to ERC20Mintable
* move MintableToken.sol to ERC20Mintable.sol, likewise test and mock files
* rename BurnableToken to ERC20Burnable
* move BurnableToken.sol to ERC20Burnable.sol, likewise for related files
* rename CappedToken to ERC20Capped
* move CappedToken.sol to ERC20Capped.sol, likewise for related files
* rename PausableToken to ERC20Pausable
* move PausableToken.sol to ERC20Pausable.sol, likewise for related files
* rename DetailedERC20 to ERC20Detailed
* move DetailedERC20.sol to ERC20Detailed.sol, likewise for related files
* rename ERC721 to IERC721, and likewise for other related interfaces
* move ERC721.sol to IERC721.sol, likewise for other 721 interfaces
* rename ERC721Token to ERC721
* move ERC721Token.sol to ERC721.sol, likewise for related files
* rename ERC721BasicToken to ERC721Basic
* move ERC721BasicToken.sol to ERC721Basic.sol, likewise for related files
* rename ERC721PausableToken to ERC721Pausable
* move ERC721PausableToken.sol to ERC721Pausable.sol
* rename ERC165 to IERC165
* move ERC165.sol to IERC165.sol
* amend comment that ERC20 is based on FirstBlood
* fix comments mentioning IERC721Receiver
* added explicit visibility (#1261)
* Remove underscores from event parameters. (#1258)
* Remove underscores from event parameters.
Fixes#1175
* Add comment about ERC
* Move contracts to subdirectories (#1253)
* Move contracts to subdirectories
Fixes#1177.
This Change also removes the LimitBalance contract.
* fix import
* move MerkleProof to cryptography
* Fix import
* Remove HasNoEther, HasNoTokens, HasNoContracts, and NoOwner (#1254)
* remove HasNoEther, HasNoTokens, HasNoContracts, and NoOwner
* remove unused ERC223TokenMock
* remove Contactable
* remove TokenDestructible
* remove DeprecatedERC721
* inline Destructible#destroy in Bounty
* remove Destructible
* Functions in interfaces changed to "external" (#1263)
* Add a leading underscore to internal and private functions. (#1257)
* Add a leading underscore to internal and private functions.
Fixes#1176
* Remove super
* update the ERC721 changes
* add missing underscore after merge
* Fix mock
* Improve encapsulation on SignatureBouncer, Whitelist and RBAC example (#1265)
* Improve encapsulation on Whitelist
* remove only
* update whitelisted crowdsale test
* Improve encapsulation on SignatureBouncer
* fix missing test
* Improve encapsulation on RBAC example
* Improve encapsulation on RBAC example
* Remove extra visibility
* Improve encapsulation on ERC20 Mintable
* Improve encapsulation on Superuser
* fix lint
* add missing constant
* Addressed review comments.
* Fixed build error.
* move interface ids to implementation contracts
* Do not prefix getters
* Improve encapsulation on Crowdsales
* add missing tests
* remove only
* Improve encapsulation on Pausable
* add the underscore
* Improve encapsulation on ownership
* fix rebase
* fix ownership
* Improve encapsulation on payments
* Add missing tests
* add missing test
* Do not prefix getters
* Do not prefix getters
* Fix tests.
* Update modifiers to call public view functions.
Fixes#1179.
* Improve encapsulation on BreakInvariantBounty
* Make researchers private
* Improve encapsulation on Crowdsales
* add missing tests
* remove only
* Improve encapsulation on Pausable
* add the underscore
* Improve encapsulation on ownership
* fix rebase
* fix ownership
* Improve encapsulation on payments
* Add missing tests
* add missing test
* Do not prefix getters
* Do not prefix getters
* Do not prefix getters
* Fix tests.
* tmp
* remove isMinter
* fix is owner call
* fix isOpen
* Fix merge
* tmp
* Improve encapsulation on TimedCrowdsale
* Add missing parentheses
* Use prefix underscore for state variables and no underscore for parameters
* Improved Roles API. (#1280)
* Improved Roles API.
* fix linter error
* Added PauserRole. (#1283)
* remove duplicate function definition
* Remove Claimable, DelayedClaimable, Heritable (#1274)
* remove Claimable, DelayedClaimable, Heritable
* remove SimpleSavingsWallet example which used Heritable
(cherry picked from commit 0dc711732a)
* Role behavior tests (#1285)
* Added role tests.
* Added PauserRole tests to contracts that have that role.
* Added MinterRole tests to contracts that have that role.
* Fixed linter errors.
* Migrate Ownable to Roles (#1287)
* Added CapperRole.
* RefundEscrow is now Secondary.
* FinalizableCrowdsale is no longer Ownable.
* Removed Whitelist and WhitelistedCrowdsale, redesign needed.
* Fixed linter errors, disabled lbrace due to it being buggy.
* Remove RBAC, SignatureBouncer refactor (#1289)
* Added CapperRole.
* RefundEscrow is now Secondary.
* FinalizableCrowdsale is no longer Ownable.
* Removed Whitelist and WhitelistedCrowdsale, redesign needed.
* Fixed linter errors, disabled lbrace due to it being buggy.
* Moved SignatureBouncer tests.
* Deleted RBAC and Superuser.
* Deleted rbac directory.
* Updated readme.
* SignatureBouncer now uses SignerRole, renamed bouncer to signer.
* feat: implement ERC721Mintable and ERC721Burnable (#1276)
* feat: implement ERC721Mintable and ERC721Burnable
* fix: linting errors
* fix: remove unused mintable mock for ERC721BasicMock
* fix: add finishMinting tests
* fix: catch MintFinished typo
* inline ERC721Full behavior
* undo pretty formatting
* fix lint errors
* rename canMint to onlyBeforeMintingFinished for consistency with ERC20Mintable
* Fix the merge with the privatization branch
* fix lint
* Remove underscore
* Delete CapperRole.test.js
* fix increaseApproval
* Role tests (#1228)
* Moved RBAC tests to access.
* Added Roles.addMany and tests.
* Fixed linter error.
* Now using uint256 indexes.
* Removed RBAC tokens (#1229)
* Deleted RBACCappedTokenMock.
* Removed RBACMintableToken.
* Removed RBACMintableToken from the MintedCrowdsale tests.
* Roles can now be transfered. (#1235)
* Roles can now be transfered.
* Now explicitly checking support for the null address.
* Now rejecting transfer to a role-haver.
* Added renounce, roles can no longer be transfered to 0.
* Fixed linter errors.
* Fixed a Roles test.
* True Ownership (#1247)
* Added barebones Secondary.
* Added transferPrimary
* Escrow is now Secondary instead of Ownable.
* Now reverting on transfers to 0.
* The Secondary's primary is now private.
* MintableToken using Roles (#1236)
* Minor test style improvements (#1219)
* Changed .eq to .equal
* Changed equal(bool) to .to.be.bool
* Changed be.bool to equal(bool), disallowed unused expressions.
* Add ERC165Query library (#1086)
* Add ERC165Query library
* Address PR Comments
* Add tests and mocks from #1024 and refactor code slightly
* Fix javascript and solidity linting errors
* Split supportsInterface into three methods as discussed in #1086
* Change InterfaceId_ERC165 comment to match style in the rest of the repo
* Fix max-len lint issue on ERC165Checker.sol
* Conditionally ignore the asserts during solidity-coverage test
* Switch to abi.encodeWithSelector and add test for account addresses
* Switch to supportsInterfaces API as suggested by @frangio
* Adding ERC165InterfacesSupported.sol
* Fix style issues
* Add test for supportsInterfaces returning false
* Add ERC165Checker.sol newline
* feat: fix coverage implementation
* fix: solidity linting error
* fix: revert to using boolean tests instead of require statements
* fix: make supportsERC165Interface private again
* rename SupportsInterfaceWithLookupMock to avoid name clashing
* Added mint and burn tests for zero amounts. (#1230)
* Changed .eq to .equal. (#1231)
* ERC721 pausable token (#1154)
* ERC721 pausable token
* Reuse of ERC721 Basic behavior for Pausable, split view checks in paused state & style fixes
* [~] paused token behavior
* Add some detail to releasing steps (#1190)
* add note about pulling upstream changes to release branch
* add comment about upstream changes in merging section
* Increase test coverage (#1237)
* Fixed a SplitPayment test
* Deleted unnecessary function.
* Improved PostDeliveryCrowdsale tests.
* Improved RefundableCrowdsale tests.
* Improved MintedCrowdsale tests.
* Improved IncreasingPriceCrowdsale tests.
* Fixed a CappedCrowdsale test.
* Improved TimedCrowdsale tests.
* Improved descriptions of added tests.
* ci: trigger docs update on tag (#1186)
* MintableToken now uses Roles.
* Fixed FinalizableCrowdsale test.
* Roles can now be transfered.
* Fixed tests related to MintableToken.
* Removed Roles.check.
* Renamed transferMintPermission.
* Moved MinterRole
* Fixed RBAC.
* Adressed review comments.
* Addressed review comments
* Fixed linter errors.
* Added Events tests of Pausable contract (#1207)
* Fixed roles tests.
* Rename events to past-tense (#1181)
* fix: refactor sign.js and related tests (#1243)
* fix: refactor sign.js and related tests
* fix: remove unused dep
* fix: update package.json correctly
* Added "_" sufix to internal variables (#1171)
* Added PublicRole test.
* Fixed crowdsale tests.
* Rename ERC interfaces to I prefix (#1252)
* rename ERC20 to IERC20
* move ERC20.sol to IERC20.sol
* rename StandardToken to ERC20
* rename StandardTokenMock to ERC20Mock
* move StandardToken.sol to ERC20.sol, likewise test and mock files
* rename MintableToken to ERC20Mintable
* move MintableToken.sol to ERC20Mintable.sol, likewise test and mock files
* rename BurnableToken to ERC20Burnable
* move BurnableToken.sol to ERC20Burnable.sol, likewise for related files
* rename CappedToken to ERC20Capped
* move CappedToken.sol to ERC20Capped.sol, likewise for related files
* rename PausableToken to ERC20Pausable
* move PausableToken.sol to ERC20Pausable.sol, likewise for related files
* rename DetailedERC20 to ERC20Detailed
* move DetailedERC20.sol to ERC20Detailed.sol, likewise for related files
* rename ERC721 to IERC721, and likewise for other related interfaces
* move ERC721.sol to IERC721.sol, likewise for other 721 interfaces
* rename ERC721Token to ERC721
* move ERC721Token.sol to ERC721.sol, likewise for related files
* rename ERC721BasicToken to ERC721Basic
* move ERC721BasicToken.sol to ERC721Basic.sol, likewise for related files
* rename ERC721PausableToken to ERC721Pausable
* move ERC721PausableToken.sol to ERC721Pausable.sol
* rename ERC165 to IERC165
* move ERC165.sol to IERC165.sol
* amend comment that ERC20 is based on FirstBlood
* fix comments mentioning IERC721Receiver
* added explicit visibility (#1261)
* Remove underscores from event parameters. (#1258)
* Remove underscores from event parameters.
Fixes#1175
* Add comment about ERC
* Move contracts to subdirectories (#1253)
* Move contracts to subdirectories
Fixes#1177.
This Change also removes the LimitBalance contract.
* fix import
* move MerkleProof to cryptography
* Fix import
* Remove HasNoEther, HasNoTokens, HasNoContracts, and NoOwner (#1254)
* remove HasNoEther, HasNoTokens, HasNoContracts, and NoOwner
* remove unused ERC223TokenMock
* remove Contactable
* remove TokenDestructible
* remove DeprecatedERC721
* inline Destructible#destroy in Bounty
* remove Destructible
* Functions in interfaces changed to "external" (#1263)
* Add a leading underscore to internal and private functions. (#1257)
* Add a leading underscore to internal and private functions.
Fixes#1176
* Remove super
* update the ERC721 changes
* add missing underscore after merge
* Fix mock
* Improve encapsulation on SignatureBouncer, Whitelist and RBAC example (#1265)
* Improve encapsulation on Whitelist
* remove only
* update whitelisted crowdsale test
* Improve encapsulation on SignatureBouncer
* fix missing test
* Improve encapsulation on RBAC example
* Improve encapsulation on RBAC example
* Remove extra visibility
* Improve encapsulation on ERC20 Mintable
* Improve encapsulation on Superuser
* fix lint
* add missing constant
* Addressed review comments.
* Fixed build error.
* Improved Roles API. (#1280)
* Improved Roles API.
* fix linter error
* Added PauserRole. (#1283)
* Remove Claimable, DelayedClaimable, Heritable (#1274)
* remove Claimable, DelayedClaimable, Heritable
* remove SimpleSavingsWallet example which used Heritable
(cherry picked from commit 0dc711732a)
* Role behavior tests (#1285)
* Added role tests.
* Added PauserRole tests to contracts that have that role.
* Added MinterRole tests to contracts that have that role.
* Fixed linter errors.
* Migrate Ownable to Roles (#1287)
* Added CapperRole.
* RefundEscrow is now Secondary.
* FinalizableCrowdsale is no longer Ownable.
* Removed Whitelist and WhitelistedCrowdsale, redesign needed.
* Fixed linter errors, disabled lbrace due to it being buggy.
* Remove RBAC, SignatureBouncer refactor (#1289)
* Added CapperRole.
* RefundEscrow is now Secondary.
* FinalizableCrowdsale is no longer Ownable.
* Removed Whitelist and WhitelistedCrowdsale, redesign needed.
* Fixed linter errors, disabled lbrace due to it being buggy.
* Moved SignatureBouncer tests.
* Deleted RBAC and Superuser.
* Deleted rbac directory.
* Updated readme.
* SignatureBouncer now uses SignerRole, renamed bouncer to signer.
* feat: implement ERC721Mintable and ERC721Burnable (#1276)
* feat: implement ERC721Mintable and ERC721Burnable
* fix: linting errors
* fix: remove unused mintable mock for ERC721BasicMock
* fix: add finishMinting tests
* fix: catch MintFinished typo
* inline ERC721Full behavior
* undo pretty formatting
* fix lint errors
* rename canMint to onlyBeforeMintingFinished for consistency with ERC20Mintable
* Fix the merge with the privatization branch
* remove duplicate CapperRole test
* rename proposals directory to drafts directory
* move TokenVesting and SignatureBouncer to drafts/
* rename BouncerMock.sol to SignatureBouncerMock.sol
* Improve encapsulation on Whitelist
* remove only
* update whitelisted crowdsale test
* Improve encapsulation on SignatureBouncer
* fix missing test
* Improve encapsulation on RBAC example
* Improve encapsulation on RBAC example
* Remove extra visibility
* Improve encapsulation on ERC20 Mintable
* Improve encapsulation on Superuser
* fix lint
* add missing constant
* Add a leading underscore to internal and private functions.
Fixes#1176
* Remove super
* update the ERC721 changes
* add missing underscore after merge
* Fix mock
* Move contracts to subdirectories
Fixes#1177.
This Change also removes the LimitBalance contract.
* fix import
* move MerkleProof to cryptography
* Fix import
* rename ERC20 to IERC20
* move ERC20.sol to IERC20.sol
* rename StandardToken to ERC20
* rename StandardTokenMock to ERC20Mock
* move StandardToken.sol to ERC20.sol, likewise test and mock files
* rename MintableToken to ERC20Mintable
* move MintableToken.sol to ERC20Mintable.sol, likewise test and mock files
* rename BurnableToken to ERC20Burnable
* move BurnableToken.sol to ERC20Burnable.sol, likewise for related files
* rename CappedToken to ERC20Capped
* move CappedToken.sol to ERC20Capped.sol, likewise for related files
* rename PausableToken to ERC20Pausable
* move PausableToken.sol to ERC20Pausable.sol, likewise for related files
* rename DetailedERC20 to ERC20Detailed
* move DetailedERC20.sol to ERC20Detailed.sol, likewise for related files
* rename ERC721 to IERC721, and likewise for other related interfaces
* move ERC721.sol to IERC721.sol, likewise for other 721 interfaces
* rename ERC721Token to ERC721
* move ERC721Token.sol to ERC721.sol, likewise for related files
* rename ERC721BasicToken to ERC721Basic
* move ERC721BasicToken.sol to ERC721Basic.sol, likewise for related files
* rename ERC721PausableToken to ERC721Pausable
* move ERC721PausableToken.sol to ERC721Pausable.sol
* rename ERC165 to IERC165
* move ERC165.sol to IERC165.sol
* amend comment that ERC20 is based on FirstBlood
* fix comments mentioning IERC721Receiver
* Add ERC165Query library
* Address PR Comments
* Add tests and mocks from #1024 and refactor code slightly
* Fix javascript and solidity linting errors
* Split supportsInterface into three methods as discussed in #1086
* Change InterfaceId_ERC165 comment to match style in the rest of the repo
* Fix max-len lint issue on ERC165Checker.sol
* Conditionally ignore the asserts during solidity-coverage test
* Switch to abi.encodeWithSelector and add test for account addresses
* Switch to supportsInterfaces API as suggested by @frangio
* Adding ERC165InterfacesSupported.sol
* Fix style issues
* Add test for supportsInterfaces returning false
* Add ERC165Checker.sol newline
* feat: fix coverage implementation
* fix: solidity linting error
* fix: revert to using boolean tests instead of require statements
* fix: make supportsERC165Interface private again
* rename SupportsInterfaceWithLookupMock to avoid name clashing
* make StandardToken state variables private
* simplify mocks
* document new internal functions
* fix link to ERC20 document
* revert order of Transfer and Mint events
* Revert "simplify mocks"
This reverts commit 371fe3e567.
* add tests for new internal functions
* add check for null account
* add checks for balances and allowance
* add inline docs to BurnableToken._burn
* remove redundant checks and clarify why
