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Where's the filter command?

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From:
Mark Carter
Date:
July 18, 2017 08:45
Subject:
Where's the filter command?
Message ID:
172bfbfc-307b-8c95-b5e1-48efe50f251f@gmail.com
How do I filter arrays?

So far I can do mapping:

say $schema.lines().map: &shlex-fields ;

How about filtering? I've loked at the docs, but it seems conspicuous by 
its absence.

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