func : callable f(err, flag) or object with write method
Function to call upon floating-point errors (‘call’-mode) or object whose ‘write’ method is used to log such message (‘log’-mode).
The call function takes two arguments. The first is a string describing the type of error (such as “divide by zero”, “overflow”, “underflow”, or “invalid value”), and the second is the status flag. The flag is a byte, whose four least-significant bits indicate the type of error, one of “divide”, “over”, “under”, “invalid”:
[0 0 0 0 divide over under invalid]In other words, flags = divide + 2*over + 4*under + 8*invalid.
If an object is provided, its write method should take one argument, a string.
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