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We may specialize
Iterators.rest
(anditerators.drop
/Iterators.take
analogously) to returnAbstractFill
s. This ensures that we hit optimized methods that are defined forAbstractFill
s, instead of generic methods for iterators. As an example, the following works after this:This also changes the behavior of slurping assignment
a, b... = Fill(3, 4)
. After this,b
is anAbstractFill
as well, whereas previously, this used to be aVector
. This is achieved by specializingBase.rest
.