Package: manpages-dev
Version: 2.62-1
Severity: normal

The copysign(3) man page says:

  The  copysign()  functions  return a value whose absolute value matches
  that of x, but whose sign matches that of y.  If x is a NaN, then a NaN
  with the sign of y is returned.

But this is ambiguous if y is 0 or NaN. It should say:

  The  copysign()  functions  return a value whose absolute value matches
  that of x, but whose sign bit matches that of y.  If x is a NaN, then a
  NaN with the sign bit of y is returned.

(The IEEE 754-1985 standard and Draft 1.4.0 of 754r are also ambiguous,
but I hope this will be fixed in the next draft.)

This is important, because in lgamma(3), the "sign" has another meaning.

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