There is no way for JsonReader to read a strict JSON-conforming Int64 in the range int.MinValue to int.MaxValue. This is an issue if reading documents generated by a strict JSON implementation.

Possible solutions:

• permitting CurrentBsonType to be Int32 or Int64 in ReadInt64
• an additional extended format, i.e. "
  Unknown macro: { "bigValue"}

  "; forces bigValue to be an Int64 regardless of the actual value.