new-sequence on arrays, the vector constructor, and resize-array, called when
growing vectors, to fill arrays with 0 instead of f. user code never observes the
initial value in these situations anyway. small speedup on bootstrap
Non-optimizing compiler now special-cases dip, 2dip, 3dip following a
literal quotation: this allows us to break the dip/slip meta-circle
without explicit calls to >r/r>
Slava Pestov
Doug Coleman
Slava Pestov