[Chicken-janitors] #1623: Implement faster vararg procedures

[Chicken Trac]

#1623: Implement faster vararg procedures
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 Reporter:  sjamaan      |                 Owner:  sjamaan
     Type:  enhancement  |                Status:  new
 Priority:  minor        |             Milestone:  someday
Component:  compiler     |               Version:  5.0.0rc1
 Keywords:               |  Estimated difficulty:  medium
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 Currently, anything that accepts optional, rest or keyword arguments has
 to build a list and then pick that list apart. This is wasteful because it
 should not be necessary at all.

 We could start with the low-hanging fruit like `case-lambda` and
 `#!optional`, where the binding of arguments and argument count checking
 is relatively simple. Handling `#!key` and `#!rest` or dotted tail rest
 argument notation is something that seems to me either too difficult and
 possibly not even worth it: you usually **want** to treat those as a list
 (but patterns like `optional` could still be handled specially, if nothing
 else refers to the identifier).

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Ticket URL: <https://bugs.call-cc.org/ticket/1623>
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