What is the length of an avro schema?

[Michael A. Smith]

AVRO-239 asks for an implementation of `__len__` in Python's
implementation of avro schema. It points to BSON as an example, but I
don't really understand what the ask is -- what's the purpose of
having a "length" of a schema, and what would it mean? If schema had a
consistent length, how could users benefit from it?

Thanks,
Michael A. Smith