(cherry picked from commit 36b85597)

(cherry picked from commit 735c03fc)

(cherry picked from commit 4519c237)

(cherry picked from commit 4ee9fd77)

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

Co-authored-by: rotciv <victorfage@gmail.com>
Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>

* Remove _isConstructor() check in initializer modifier

* add changelog entry

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

* Removing the storage associated with decimals

* changelog entry

* changelog link to new issue number

* Update contracts/token/ERC20/ERC20.sol

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

* Update contracts/token/ERC20/ERC20.sol

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

* Update CHANGELOG.md

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

Conflicts:
	CHANGELOG.md
	package-lock.json
	test/math/SafeMath.test.js

* 3.4.0-rc.0

* Allow manual dispatch of Test CI job

* Update lockfile (#2481)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

* Add "available since" comments in documentation

* Add "available since" comments in documentation

(cherry picked from commit 63a0343d)

* Remove SafeMathMock compilation warnings (#2497)

* Remove SafeMathMock compilation warnings (#2497)

(cherry picked from commit f4e57fd5)

* 3.4.0

* fix safemath test to use renamed function from the mock

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Renovate Bot <bot@renovateapp.com>

(cherry picked from commit f4e57fd5)

(cherry picked from commit 63a0343d)

* re-enabling safemath revert reasons in ERC20 and ERC1155

* adding revert messages to ERC777

* removing uncheck block

Co-authored-by: Renovate Bot <bot@renovateapp.com>

* Clean code

-  using type().interfaceId to improve readeability of ERC165 registration
- hardcoding some keccak256 that are otherwise computed at construction.

* hardcode keccak256 result

* Improve code readeability using try/catch

* Remove hardcoded hash 

tests show that solc 0.8.0 does the optimization as expected

* Use try/catch to improve readability

* ERC165Checker: Do not revert when returndata is empty + new test

* Address PR comments

* improve testing of ERC721Receiver errors

* put back comment about invalid interface id

* coverage does not support 0.8.1. Reverting back to 0.8.0

* bubble all data with length > 0 if onERC721Receive fails.

* Fix test: revert without message trigger is bubble with the default message

* using enum object to improve readability