user defined value types allow creating a zero cost abstraction over an elementary value type. This is similar to an alias, but with stricter type requirements.
unfortunately, solc 0.8.9 says
TypeError: Unary operator delete cannot be applied to type MyType
type TokenId is uint256; ... mapping(bytes32 => MyType) public myMapping; ... delete myMapping[myId];
Is there a way to keep
delete for readability, use the type definition, and avoid multiple additional