Return true if the specified lhs and rhs have the same value, and false otherwise. Two decimal objects have the same value if the compareQuietEqual operation (IEEE-754 defined, non-total ordering comparison) considers the underlying IEEE representations equal. In other words, two decimal objects have the same value if:
* both have a zero value (positive or negative), or * both have the same infinity value (both positive or negative), or * both have the value of a real number that are equal, even if they are represented differently (cohorts have the same value)
This operation stores the value of the macro EDOM into errno if either or both operands are signaling NaN.