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re: small flonum contagion

could the trig functions and sqrt be fixed so that when given 
small flonum arguments they return small flonum results like 
log and exp currently do.   

also is it true that so long as no special variables are set that 
computations on small flonums (using say log and exp in a compiled function
where the results come and go to an art-q array)
does not generate garbage?  what about the regular flonum case? 
I guess what im asking is are there any useful rules of thumb for minimizing 
garbage generation.  - keith