napi get value bigint words

napi_status napi_get_value_bigint_words(napi_env env,
                                        napi_value value,
                                        int* sign_bit,
                                        size_t* word_count,
                                        uint64_t* words);

• [in] env: The environment that the API is invoked under.
• [in] value: napi_value representing JavaScript BigInt.
• [out] sign_bit: Integer representing if the JavaScript BigInt is positive or negative.
• [in/out] word_count: Must be initialized to the length of the words array. Upon return, it will be set to the actual number of words that would be needed to store this BigInt.
• [out] words: Pointer to a pre-allocated 64-bit word array.

Returns napi_ok if the API succeeded.

This API converts a single BigInt value into a sign bit, 64-bit little-endian array, and the number of elements in the array. sign_bit and words may be both set to NULL, in order to get only word_count.