See: <a href="/doc/reference/classes/ucalc/defaultinstance-=-[ucalc]/">DefaultInstance = [uCalc]</a>, <a href="/doc/reference/classes/ucalc/removed/isdefault/isdefault-bool/">IsDefault(bool)</a>, <a href="/doc/reference/classes/ucalc/isdefault-=-[bool]/">IsDefault = [bool]</a>