Empty blocks evaluate to nil. #128
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Whilst here, it is silly for `add_global` to take a `String` when both callers have to call `to_owned` for the `&str` they really have.
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Whilst here, it is silly for
add_globalto take aStringwhen both callers have to callto_ownedfor the&strthey really have.Note this is different behaviour from (at least) Java SOM (see SOM-st/SOM#36).