|Subject:||Apache::Session::Store::File stomps on $_|
Apache::Session::Store::File has while (<$fh>) loop which uses $_. Since while does not localize $_, this stomps on any $_ values from loops in the caller. This leads to weird errors like "Modification of a read-only value" or values being unexpectedly modified. The solution is either localize $_ before the loop or use a lexical variable.