unbounded growth from parameterize

[Jim Rees]

I know of no practical use case for an unbounded number of created and forgotten parameter objects, so assign the appropriate level of priority to this -- I just thought it was an interesting case. I recently realized this was possible on my own toy scheme and fixed it by switching to ephemerons in my continuation-marks cell representation. chibi, mit-scheme, chez, guile, gauche -- all have unbounded growth on this test as well.

#;1> (let loop () (parameterize (((make-parameter #f) (make-vector 10000))) (loop)))
[panic] out of memory - heap has reached its maximum size - execution terminated