There isn't necessarily a bug (i.e. incorrect statement) in the documentation - it may be just an omission

The docs says the conversion occurs until \E, but perl keeps going pass \E in some circumstances. Call it what you want.

In reply to Re^3: Interactions of \Q, \U, \L and \E by ikegami
in thread Interactions of \Q, \U, \L and \E by ig

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