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Do real secp256k1 point->curve checking #1786

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Do real secp256k1 point->curve checking #1786

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Commits on Mar 24, 2022

  1. Do real secp256k1 point->curve checking 

    * This is a breaking change, as it requires the JS environment to have
BigInt (all supported versions of JavaScript engines appear to).
* This check may prevent loss of funds by eliminating a category of
unspendable addresses from being created.
* Performance is almost as fast as tiny-secp256k1 39-42us vs 33-35us.
* Added `isXOnlyPoint` to types, expecting it to be used for Taproot.
    @reardencode
    reardencode committed Mar 24, 2022
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