Internal Program Version: mpdecimal  2.5.1

libmpdec is a C implementation of the General Decimal Arithmetic
Specification. The specification defines a general purpose arbitrary
precision data type together with rigorously specified functions and
rounding behavior. libmpdec conforms - with minor restrictions - to
the IEEE 754-2008 Standard for Floating-Point Arithmetic.

https://www.bytereef.org/mpdecimal/index.html