Cider-find-dwim doesn't recognize symbols with ? and ! marks

[introom]

On a symbol name teardown!, cider-find-dwim will recoganize it as teardown. This happens for symbols ending with ? too.

[yuhan0]

This appears to be from cider--find-dwim-interactive which calls (thing-at-point 'filename) to attempt to resolve the symbol-or-file.

thingatpt.el in turn defines a filename to be

(defvar thing-at-point-file-name-chars "-@~/[:alnum:]_.${}#%,:"
  "Characters allowable in filenames.")

which is strange because filenames can contain a much wider range of characters (including ? and !).

A solution could be to disambiguate symbols and files based on whether the point is in a string? I can't see why filenames in code would ever be represented as anything besides a string (or maybe a comment). cider-symbol-at-point would then work for symbols with special characters.

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