Hi,
I reviewed, applied and tested patch v2 on Linux x64 and MacOS x64. LGTM.
> I'm not especially in love with the CANTMATCH arc type name, but
> other possibilities such as DUMMY or NOMATCH felt too generic.
> Better ideas anyone?
Well... at least it's consistent with the current naming e.g.
HASCANTMATCH. I suggest keeping it as is.
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Best regards,
Aleksander Alekseev