[perl #76994] [BUG] Bare 'i' not recognised as a Complex()

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When 'i' is not prefixed by a number it's not recognised as a Complex
number.

> 5i.WHAT
Complex()
> i.WHAT
Could not find sub &i

i.WHAT is ok for the std evalbot on #perl6, but it's not for Rakudo.
Same happens for e.g. (2 + i).