Here's an interesting, perhaps controversial, PR: It enhances decodeMathChar to also lookup math properties (role, meaning,...) for the decoded glyph from the Unicode module. This provides some parity between symbols defined "semantically" by bindings and low-level \mathchar, in the simple cases. This covers most of what TeX's plain defines, asitdefines them!
Here's an interesting, perhaps controversial, PR: It enhances
decodeMathCharto also lookup math properties (role, meaning,...) for the decoded glyph from the Unicode module. This provides some parity between symbols defined "semantically" by bindings and low-level\mathchar, in the simple cases. This covers most of what TeX's plain defines, as it defines them!