TL;DR: this has several virtues:
- Unifies Tuple and List access and replacement
- Sequential.seek/2 inherently implies that previous Enum functions will
iterate fully over the whole enumerable
- Countable infinities have an opportunity to raise on negative index access
- Paves the way for a cacheable enumerable Stream.sequence/1 function that
takes an enumerable and allows the user to flag an otherwise
destructive-on-read stream as a countable infinity where values might be
re-accessed, allowing it to enumerate the stream and cache values on access
- Paves the way for a set of Sequence.xxx/0 functions that procure useful
Stream.sequences like Sequence.primes/0 and Sequence.fibonacci/0
- Paves the way for Sequence.product/{1,2} functions that take the
cartesian product of possibly infinite, but countable streams
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