requires that special cases be handled as if implemented as 1.0 / x.
adopts the same "type promotion" language as other unary element-wise APIs, which is based on the premise that an input array promotes to itself. If this language should be changed, we should do as part of a follow-up PR across all relevant element-wise APIs.
requires ("should") that the input array have a floating-point data type, as the output array should have a floating-point data type and promotion of mixed kinds is left unspecified.
This PR
1.0 / x
.