@silverpill I agree, huge parts of the spec don't have enough interoperable implementations to justify them. However, this rule also means it's super hard to 'upstream' a FEP into the spec because it's hard to count implementations that do exactly what the FEP says.

@silverpill 'Implemented' is not boolean, some FEPs have partial implementations, implementations of a prior draft or implementations that do the opposite of a MUST