[m-rev.] for post-commit review: propagate type char into insts

[Zoltan Somogyi]

2021-06-08 07:57 GMT+10:00 "Zoltan Somogyi" <zoltan.somogyi at runbox.com>:
> For review by anyone.

This further diff optimizes the predicate touched by the previous diff.

Zoltan.
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