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Which issue does this PR close?
Closes #4286
Rationale for this change
This is the simple solution to #4286. The downside of this is it prevents the usage of non-Send Write, however, avoiding this would involve not using trait objects and instead plumbing the generics through. I'll continue to explore this, but I suspect the simple solution is the best option.
What changes are included in this PR?
Are there any user-facing changes?