Some unicode symbols are not allow in literal characters or strings

main = putChar 'ₖ'

This program is rejected with following error message: lexical error in string/character literal at character '\8342'

There is at least a few other characters with the same issue, for instance this whole string should be accepted: "ₕₖₗₘₙₒₚᵣₛₜᵤᵥₓ"

A related issue is that GHCi do not let me paste these characters either.

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