Do not directly access call.
We shouldn't have any used inputs to clear.
Don't delete a computation just because it was unmapped from one context.
Don't refer to computation directly.
Switch argument order for uniquify_reg(,)
Add unused code to unshare a shared computation.
Move all invalidation after discovery of regs to invalidate.
Remove unused variable.
Stop directly reclaiming computations outside of garbage collection.
Re-evaluate regs should be evaluated.