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f, g, h - function input
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n - integer input usually a size
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index - integer index
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x, y - numbers
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s - string input
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coll - a collection
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pred - a predicate closure
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& more - variadic input
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expr - an expression
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body - a macro body
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binding - a macro binding vector
first and rest are defined in terms of position, and work on anything that can be treated as an ordered collection
peek and pop work in terms of "natural insertion order" and only work with things that behave like a stack - (so not lazy-seqs, strings, etc.)
lists push and pop from the front, vectors push and pop from the end, queues push to one end, pop from the other