view doc/README @ 51714:45d5e9a0f6a6

typing: add some type hints to fastannotate that have decayed in the last year

Somewhere since 10db46e128d4, `_knownopts` decayed to `set` for unknown reasons.
Also, `annotateopts.default` changed from bytes to str.  While that is correct,
I noticed that PyCharm was flagging the member fields as undefined in
`shortstr()`, so add those to keep it happy.  (There are no complaints from
pytype because that module is excluded, due to the missing reference to
`linelog.copyfrom()` that I'm not sure how to fix.)

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