[issue9011] ast_for_factor unary minus optimization changes AST

[Mark Dickinson]

Mark Dickinson added the comment:

No, that's expected behaviour.

1j is complex(0.0, 1.0)
-1j is complex(-0.0, -1.0)

so -1j.real is -0.0.  There's not really any other sensible way to handle this.

The complex-from-string constructor, on the other hand, is more careful about interpreting signs.

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