Can't handle 2 file handles against the same file.

[toddr]

my $f = Test::MockFile->file("/abc", "content");
open(my $fh, "<", "/abc");
open(my $fh2, "<", "/abc"); # This'll break stuff.

[xsawyerx]

Technically, you are allowed to create multiple different filehandles to the same file, so I am classifying this as a bug.

[toddr]

Agreed. It'd be good to fix this but we're probably going to have to change the code that tracks all of this. I sure hope this doesn't bring up fileno :D