Since environment variable names should only consist of uppercase letters, digits, and the '' (underscore), this PR adjusts the file-replacement syntax to require 2 underscores like `GF___FILE(with double underscore) so that it isn't ambiguous when the setting ends with_FILE` (single underscore).
Since environment variable names should only consist of uppercase letters, digits, and the '' (underscore), this PR adjusts the file-replacement syntax to require 2 underscores like `GF___FILE
(with double underscore) so that it isn't ambiguous when the setting ends with_FILE` (single underscore).