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OpenType Layout Features - Comments
The script-based syntax to define OpenType Layout Features supports single line comments. A single line comment ends at the end of the line. To add comments to your script, simply add a # (number sign) in front of it. Alternatively use two subsequent slashes:
# This is comment
// This is comment as well
In general comments are not useful, as they will be lost as soon as the code is compiled into binary OpenType layout features.