merge revision(s) 5d1702e01a36e11b183fe29ce10780a9b1a41cf0: [Backport #20413]
Enumerator should use a non-blocking fiber, change `rb_fiber_new` to be non-blocking by default. (#10481)
merge revision(s) 5d1702e01a36e11b183fe29ce10780a9b1a41cf0: [Backport #20413]