From @zoffixznet

- Seq.skip mutates the invocant​:
  $ ./perl6 -e 'my $s := (1, 2, 3).Seq; $ = $s.skip; say $s'
  (2 3)

- List.skip does not​:
  $ ./perl6 -e 'my $s := (1, 2, 3); $ = $s.skip; say $s'
  (1 2 3)

And the real pain point is that a cached Seq is basically a list.
Currently, .skip on a Seq crashes. I tried to fix[^1] the crash, but
the fixed version has these inconsistent semantics that `Seq.skip`
will either modify the invocant or not, depending on whether the Seq
is cached.

  $ ./perl6 -e 'm​: my $s := (1, 2, 3).Seq; $s.cache; $ = $s.skip; say $s'
  (1 2 3)
  $ ./perl6 -e 'm​: my $s := (1, 2, 3).Seq; $ = $s.skip; say $s'
  (2 3)

I don't see .skip in 6.c tests, so I think we still have a chance to
improve it. The question's​: how? Any ideas?

[1] https://gist.github.com/zoffixznet/98ee33398ac7979c0adc4a4a88696b85

From @zoffixznet

On Fri, 29 Sep 2017 09​:07​:40 -0700, cpan@​zoffix.com wrote​:

- Seq.skip mutates the invocant​:

No longer. It now consumes the iterator, which aligns the behaviour with Any.skip.

Fixed by lizmat++ in rakudo/rakudo@854c10c27e
Tests​: Raku/roast@49956451de

@zoffixznet - Status changed from 'new' to 'resolved'