FIND-IF* lazy-sequence, hash-table, array: remove conditional in loop.
POSITION* lazy-sequence, hash-table, array: remove conditional in loop.
POSITION-IF* lazy-sequence, hash-table, array: remove conditional in loop.
REMOVE* hash-table: remove conditional in loop.
REMOVE* hash-table: add count keyword.
REMOVE-IF* hash-table: remove conditional in loop.
SUBSTITUTE* lazy-sequence, hash-table, array: remove conditional in loop.
SUBSTITUTE-IF* lazy-sequence, hash-table, array: remove conditional in loop.