format

decimal128 - A decimal floating-point number with 34 significant decimal digits

JSON Data Type: string, number.

The decimal128 format represents a 128-bit decimal floating-point number as defined by IEEE 754 2008 and ISO/IEC/IEEE 60559:2011.

Representation as a JSON string is preferred as this avoids problems with recipients that parse JSON numbers into binary64 memory representation.

String representation allows expressing the special values NaN, -INF, and INF that cannot be expressed as JSON numbers.