IOFT.sol doesn't include `.decimals()` function

[jaycoolslm]

Why doesn't the IOFT.sol interface (https://github.com/LayerZero-Labs/LayerZero-v2/blob/main/packages/layerzero-v2/evm/oapp/contracts/oft/interfaces/IOFT.sol) include the standard ERC-20 .decimals() function?

This means when using something like hardhat and trying to query the decimals of an OFT, the following error throws:

TypeError: dstOftContract.decimals is not a function

A solution is to take the OFT address and use the standard ERC20 interface to find out the decimals e.g.

const erc20 = new Contract(dstOftContract.address, ERC20_DECIMALS_ABI, dstOftContract.provider)
localDecimals = await erc20.decimals()

However it would be nicer IMO if poss to call dstOftContract.decimals()