wcwidth \( wcwidthForbidden warning

Always use fish_wcwidth rather than wcwidth.

wcswidth \( wcswidthForbidden warning

Always use fish_wcswidth rather than wcswidth.

<--!> ]]> flock \( flockSemanticsWarning warning

flock has a fallback implemented in terms of fcntl; ensure that the fcntl semantics will apply (see http://0pointer.de/blog/projects/locking.html)