# Functions
GetImplementation returns the implementation address of the proxy contract, it used sync.QuickGroup to get the result as soon as possible.
# Variables
No description provided by the author
SlotERC1967 key from https://eips.ethereum.org/EIPS/eip-1967#:~:text=0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc.
https://github.com/OpenZeppelin/openzeppelin-labs/blob/54ad91472fdd0ac4c34aa97d3a3da45c28245510/initializer_with_sol_editing/contracts/UpgradeabilityProxy.sol#L19-L24.