ERC1003, ERC827: ERC20 extensions for sending tokens to smart contracts

[nventuro]

@abcoathup

I like the idea of a lightweight ERC20 compatible approve and call standard.
Approve and call in a single transaction is essential in my opinion for good user experience.

Indeed, it may be useful for scenarios such as this one: Contract standard for accepting any ERC20 (or ERC721?) as payment