Returns the maximum number of x and y, favouring numbers over NaNs.
If both x and y are numbers, the maximum is returned.
If both parameters are NaN, either will be returned.
If one parameter is a NaN and the other is a number, the number is
returned (this behaviour is mandated by IEEE 754-2008, and is useful
for determining the range of a function).
Returns the maximum number of x and y, favouring numbers over NaNs.
If both x and y are numbers, the maximum is returned. If both parameters are NaN, either will be returned. If one parameter is a NaN and the other is a number, the number is returned (this behaviour is mandated by IEEE 754-2008, and is useful for determining the range of a function).