create a tuple of two Sequences by splitting this at
either
the given index, i.e., a Sequence of length 'at' and one of length 'count-at'. at may be <= 0 or >= count, in which case the resulting tuple will be the (empty list, Sequence.this.as_list) or (Sequence.this.as_list, empty list), resp.
or
at first result of condition function
0.095dev (2025-10-09 18:01:25 GIT hash 4826e516431c193e428991dd546a46472973d8d4 built by fridi@fzen)
either
the given index,
i.e., a Sequence of length 'at' and one of length 'count-at'.
at may be <= 0 or >= count, in which case the resulting tuple will be the
(empty list, Sequence.this.as_list) or (Sequence.this.as_list, empty list), resp.
or
at first result of condition function