Fix Symbol#to_proc (rb_sym_to_proc) to be ractor safe
In non-main ractors, don't use sym_proc_cache. It is not thread-safe
to add to this array without a lock and also it leaks procs from one
ractor to another. Instead, we create a new proc each time. If this
results in poor performance we can come up with a solution later.
Fix Symbol#to_proc (rb_sym_to_proc) to be ractor safe
In non-main ractors, don't use
sym_proc_cache. It is not thread-safeto add to this array without a lock and also it leaks procs from one
ractor to another. Instead, we create a new proc each time. If this
results in poor performance we can come up with a solution later.
Fixes [Bug #21354]