> ## Documentation Index
> Fetch the complete documentation index at: https://docs.superfloat.si/llms.txt
> Use this file to discover all available pages before exploring further.

# Immutability

> Decision log: immutability

`SFScalar.__setattr__` allows `_code` to be set once (construction) and
rejects everything else; `__delattr__` always rejects. Hash and equality can
therefore never change after a value is used as a dict key.


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