@[&5;3 3 3;+;1] #63
Description
amend with repeated indexes modifies only once.
@[&5;3 3 3;+;1] is 0 0 0 1 0
but is 0 0 0 3 0 in most implementations.
x[3 3 3]+:1 is rewritten as x[3 3 3]:x[3 3 3]+1, e.g. modified once, assigned in a loop.
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