feat: flatten errors.Join results in Combine/Append - #86
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errors.Join implements the multi-error Unwrap interface. Treat those the same as nested multierr values so Combine(errors.Join(a,b), c) yields a flat list of a, b, c.
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What
Combine/Appendflatten values that implement the multi-errorUnwrap() []errorinterface (includingerrors.Joinfrom Go 1.20+), the same way nested multierr values are already flattened.Why
multierr.Combine(errors.Join(a, b), c)previously kept the join as a single nested error. Callers using both packages expect a flat list forErrors/errors.Is.Test
TestCombineFlattensErrorsJoin