One more note to the datatype of the EMIT argument. Due to the USE 
limitations is my implementation currently able to work correctly with 
word! and set-word! only. Wouldn't it be desirable to explicitly limit 
the datatype of the argument as follows:

    'emit [word! set-word!]

or even

    'emit [word!]

?

another option may be to change the implementation to accept a few more 
word types, but even then it may be desirable to use a datatype 
specification, because it isn't sensible to accept e.g. paths etc.

-L

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