Commits on Jun 28, 2020

1. Freeze absolute paths to reduce allocations on file operations …

   Most of the `File` methods cast the paths it receives with `FilePathValue`
   which ultimately delegate to `rb_new_str_frozen`.
   
   `rb_new_str_frozen` could be experessed as `str.frozen? ? str : str.dup`.
   
   So by freezing the paths passed to the various `File.` methods, we
   save at least one useless allocation each time, unless the string encoding
   is incompatible with the file system.
   
   ```
   s = __FILE__
   alloc = GC.stat[:total_allocated_objects]
   File.realpath(s)
   p GC.stat[:total_allocated_objects] - alloc # => 3
   
   s = __FILE__.freeze
   alloc = GC.stat[:total_allocated_objects]
   File.realpath(s)
   p GC.stat[:total_allocated_objects] - alloc # => 2
   ```

   

   byroot committed Jun 28, 2020
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