I've seen very large JSON files passed around in zipped form, and there's a Python library that reads them in this form (afaict without first creating an uncomp

I've seen very large JSON files passed around in zipped form, and there's a Python library that reads them in this form (afaict without first creating an uncompressed version of the entire zipfile). I would think if you zipped a JSON file where the fields are repeated, the compression algorithm would pick up on this and compress those field names (including their quotes and trailing colon etc.). Or do I misunderstand how compression works?