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feat(js): add exact BigInt conversions, toI128LowBits and fromWords - #91
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napi fills the low-order words and the sign even when the BigInt needs more words than the buffer holds. Setting sign_bit before returning error.Overflow lets callers catch the error and read the truncated value. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
BigInt.toI64Exact and BigInt.toU64Exact return error.Overflow when the value does not fit, instead of the low 64 bits toI64/toU64 return. BigInt.toI128LowBits returns BigInt.asIntN(128) semantics. Existing methods are unchanged. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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🤖 I have created a release *beep* *boop* --- ## [4.4.0](zapi-v4.3.0...zapi-v4.4.0) (2026-11-13) ### Features * **js:** add exact BigInt conversions, toI128LowBits and fromWords ([#91](#91)) ([b56bf2d](b56bf2d)) ### Performance Improvements * use c allocator for shared io ([#92](#92)) ([a736d8a](a736d8a)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please). Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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Motivation
The fuzz harness in #41 needs exact BigInt conversions and word-level construction. These are the non-breaking parts of #83, so #41 can merge without waiting for the breaking change.
Description
Adds
BigInt.toI64Exact/toU64Exact(throwOverflowinstead of returning low bits),BigInt.toI128LowBits(BigInt.asIntN(128)) andBigInt.fromWords. It also fixesgetValueBigintWordsleavingsign_bitunset on overflow, and documents N-APINumberconversion semantics. Existing methods are unchanged.🤖 Generated with Claude Code