Add method to init MaybeUninit<ArrayDeque>
#28
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Currently
Box::new(ArrayDeque::<1_000_000, u32>())will likely cause a stackoverflow due to theArrayDequebeing written to the stack and then copied into the Box. This occurs even in release mode.This manifests as a SIGSEGV for me on macOS (at least until rust-lang/rust#77071 lands).
This method is necessary to avoid such a stack overflow.