upgraded-complex-part-type typespec {&optional environment} => upgraded-typespec
typespec---a type specifier.
environment---an environment object. The default is nil, denoting the null lexical environment and the and current global environment.
upgraded-typespec---a type specifier.
upgraded-complex-part-type returns the part type of the most specialized complex number representation that can hold parts of type typespec.
The typespec is a subtype of (and possibly type equivalent to) the upgraded-typespec.
The purpose of upgraded-complex-part-type is to reveal how an implementation does its upgrading.
section complex [Function] (function and type)
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