tpope/vim-fugitive — pull request #184 by flatcap (2012-04-03 22:51:53+00:00)
Title: [BUG] wildignore breaks Gwrite

When the file you're editing matches the vim variable
wildignore Gwrite fails.

There are a few more occurences of `=variable`, but they either refer to directories or git objects.
They're unlikely to match someone's ignorelist.