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KNOWN BUGS IN ZSH
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The pattern %?* matches names beginning with %? instead of names with at
least two characters beginning with %. This is a hack to allow %?foo job
substitution without quoting. This behaviour is incompatible with sh
and ksh and may be removed in the future. A good fix would be to keep
such patterns unchanged if they do not match regardless of the state of
the nonomatch and nullglob options.
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It is currently impossible to time builtins.
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40106: The comp* completion-related builtins (compadd, compset, etc) are
run with $_comp_options in effect, rather than the user's options.
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users/20807: vcs_info quilt 'addon' mode: hook lookup context specifies
the underlying VCS but not whether quilt is used.

Workaround: test (( ${+funcstack[(r)VCS_INFO_quilt]} )).
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41184: 'exec' optimization for last command in a subshell should be
skipped when STTY=... is set for that command
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41203 and others: Make it easier to maintain C modules out of tree.
(May require defining a stable API for modules, see 41254)
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44007 - Martijn - exit in trap executes rest of function
See test case in Test/C03traps.ztst.
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45282: ${${:-foo}:P} where foo is a symlink that points to itself segfaults
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