Richard's changeset preamble thoroughly documents his enhancement.  The
code is very clear and straightforward.  Here are some sample test
do-its:

{{ 'Richard''s'. }.  { 'mapcan'.  'changeset'. }.   { 'works'.  'just'. 
'fine'.  }} concatenation

(#( 1 2 3 4 5 6 7 8 9 ) collect: [ :num | { 2 * num.  3 * num.  5 * num.
} ]) concatenation













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