rakudo/rakudo — pull request #151 by lizmat (2013-05-19 18:32:32+00:00)
Title: It doesn't make sense to do .kv on hash slices, does not do what you think

...think.

Instead you should use :kv. However, since .kv *also* generates Pairs, but
with different key values, this has the potential of silently corrupting your
data. Therefor I think it is wise to simply not allow .kv to be called on
scalar values. Did I miss any?