Fix #480: tanh derivative saturates instead of collapsing to a wrong finite value - #503

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fix-480-tanh-overflow

Commits on Sep 19, 2026

Fix #480: tanh's derivative saturates instead of collapsing for large x
petlenz
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db6202a
Characterise the negative-side band the new tanh form degrades in
petlenz
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04aea15