add cache props for ...init, last pattern matching

[cometkim]

• last is derived value from tail
• init is the previous vector

This enables vec{...init, last} like pattern matching

The problem with this implementation is init introduce self-referencing which makes it too deep to serialize. As the result, existing tests are failed because of stackoverflow while checking the equality

We need a smarter way to make init more efficient or an alternative structure.

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[cometkim]

Ok we dont need this