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Option Result library for c#
(programming.dev)
A collection of tools for dealing with nulls, failures and the generic type issues that arise in this domain.
https://github.com/Andy3432344/SafeResults
I'm the author, let me know what you think!
*Edit: updated to show GitHub link, sorry!
I very much disagree with this, Null Reference Exceptions have been a huge problem in c#. Nullable reference types are a partial fix, but the question of "how do I 'return' an error from a statically typed method" is not answered there.