Why does casting Double.NaN to int not throw an exception in Java?

Question

So I know the IEEE 754 specifies some special floating point values for values that are not real numbers. In Java, casting those values to a primitive int does

Answer 1

There is an ACM presentation from 1998 that still seems surprisingly current and brings some light: https://people.eecs.berkeley.edu/~wkahan/JAVAhurt.pdf.

More concretely, regarding the surprising lack of exceptions when casting NaNs and infinities: see page 3, point 3: "Infinities and NaNs unleashed without the protection of floating-point traps and flags mandated by IEEE Standards 754/854 belie Java’s claim to robustness."

The presentation doesn't really answer the "why's", but does explain the consequences of the problematic design decisions in the Java language's implementation of floating point, and puts them in the context of the IEEE standards and even other implementations.