Add bigintconverter to serialize int64 and uint64 to string#13

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fix/add-bigintconverter-serialize-to-string

Commits on Apr 7, 2026

Add BigIntConverter to serialize BigInt types to string and update serializer options handling
matnun-br
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Fix BigIntConverter: use Utf8JsonReader APIs, invariant culture, and JsonException on failure

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Revert "Fix BigIntConverter: use Utf8JsonReader APIs, invariant culture, and JsonException on failure"
matnun-br
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Refactor BigIntConverter and Serializer: make default converter and options fields private
matnun-br
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Rename LongConverter and ULongConverter to Int64ToStringConverter and UInt64ToStringConverter; update serializer options accordingly
matnun-br
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Fix BigIntConverter to use invariant culture for conversions and update serializer options handling
matnun-br
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minor mechanical change
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Rename
clement911
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Update documentation for JsonSerializerOptions to clarify default converters included
matnun-br
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