Re: BUG #2037: user function call unexpected "input out of range"

"Tom" <lackey@ltu.edu> writes:
> Description:        user function call unexpected "input out of range"

Why does this surprise you?  Floating point computation is inherently
inexact, so coming out with a value fractionally greater than 1 for
the acos() argument doesn't seem all that unlikely.  You probably
ought to add some code to clamp the result to the legal range.

            regards, tom lane