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searchableSequence -- a Sequence whose elements inherit from hasEquals

In contrast to searchablelist, this uses ref type 'list' and not choice
type 'list', so it is more flexible.

create a list from this Sequence.

redefines Sequence.asList:
create a list from this Sequence.

A list is immutable, so it can be reused and shared between threads.
Compared to a stream, a list may require more (heap) allocation.

Default implementation uses asStream. Heirs must redefine at least
one of asList or asStream.

get the number of non-overlapping matches of l within this

get the number of matches of l

get the index of l within this list or nil if it does not exist

determine the index of element x within this list. 0 if x is at the
head of the list, 1 if it comes directly after head, etc. nil if x is
not in the list.

replace all occurances of f by r

does this list start with l?