Welcome to a new release of OpenZeppelin Contracts! :dancers:
The big feature in this release is that we’ve migrated our proxy contracts from OpenZeppelin SDK into the Contracts project. We hope this will make more people aware of upgrades in Ethereum, and we also think the contracts will benefit greatly from the continued scrutiny by all of you in the community. This was also a migration of the proxies from Solidity 0.5 to 0.6, which we know some users have been waiting for.
For Solidity 0.7 users, a reminder that we have support for the newer compiler version published on npm under the tag solc-0.7, the latest release being 3.2.0-solc-0.7. We’re considering officially switching to 0.7 for the release after this one.
There is additionally a small breaking change in ERC20Snapshot that may affect some of its users. If you’re one of them please take a look at the changelog.
Proxies: added the proxy contracts from OpenZeppelin SDK. (#2335)
Proxy changes with respect to OpenZeppelin SDK
Aside from upgrading them from Solidity 0.5 to 0.6, we've changed a few minor things from the proxy contracts as they were found in OpenZeppelin SDK.
UpgradeabilityProxy was renamed to UpgradeableProxy.
AdminUpgradeabilityProxy was renamed to TransparentUpgradeableProxy.
Proxy._willFallback was renamed to Proxy._beforeFallback.
UpgradeabilityProxy._setImplementation and AdminUpgradeabilityProxy._setAdmin were made private.
Improvements
Address.isContract: switched from extcodehash to extcodesize for less gas usage. (#2311)
Breaking changes
ERC20Snapshot: switched to using _beforeTokenTransfer hook instead of overriding ERC20 operations. (#2312)
This small change in the way we implemented ERC20Snapshot may affect users who are combining this contract with
other ERC20 flavors, since it no longer overrides _transfer, _mint, and _burn. This can result in having to remove Solidity override(...) specifiers in derived contracts for these functions, and to instead have to add it for _beforeTokenTransfer. See Using Hooks in the documentation.
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Bumps @openzeppelin/contracts from 3.1.0 to 3.2.0.
Release notes
Sourced from @openzeppelin/contracts's releases.
Changelog
Sourced from @openzeppelin/contracts's changelog.
Commits
1ada3b63.2.045b81c9Add note about proxy changes in the changelogf2fb8cf3.2.0-rc.09f900f6Add changelog entries for proxies and ERC20Snapshot91f16a7Adapt proxies to Contracts conventions (#2345)6bc2ae3Add documentation for proxies (#2344)885b76fFix AsciiDoc missing attribute referencesded2b0aFix minor typos and grammar in docs (#2338)0f08b1dUpdate dependency mocha to v8.1.3 (#2340)aaa5ef8Fix typos (#2343)Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting
@dependabot rebase.If all status checks pass Dependabot will automatically merge this pull request.
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