Yury Selivanov wrote:
    def foo():
         var = ContextVar()
         var.set(1)

    for _ in range(10**6): foo()

If 'var' is strongly referenced, we would have a bunch of them.

Erk. This is not how I envisaged context vars would be
used. What I thought you would do is this:

   my_context_var = ContextVar()

   def foo():
      my_context_var.set(1)

This problem would also not arise if context vars
simply had names instead of being magic key objects:

   def foo():
      contextvars.set("mymodule.myvar", 1)

That's another thing I think would be an improvement,
but it's orthogonal to what we're talking about here
and would be best discussed separately.

--
Greg
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