Change Details

Partial backport of secp256k1#831: https://github.com/bitcoin-core/secp256k1/pull/831/commits/5437e7bdfbffddf69fdf7b4af7e997c78f5dafbf Depends on D9406.

Partial backport of [[https://github.com/bitcoin-core/secp256k1/pull/831 | secp256k1#831]]: https://github.com/bitcoin-core/secp256k1/pull/831/commits/5437e7bdfbffddf69fdf7b4af7e997c78f5dafbf Depends on D9406.

Partial backport of [[https://github.com/bitcoin-core/secp256k1/pull/831 | secp256k1#831:]]: https://github.com/bitcoin-core/secp256k1/pull/831/commits/5437e7bdfbffddf69fdf7b4af7e997c78f5dafbf Depends on D9406.