Add borrowed-only version of ZeroMap #1238
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Nov 9, 2021
Co-authored-by: Shane F. Carr <shane@unicode.org>
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Co-authored-by: Shane F. Carr <shane@unicode.org>
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Fixes #676
Part of #1082
The ZeroMapBorrowed code is basically a straight copy-paste of the ZeroMap code (which in turn is extremely thin wrappers itself) tweaked to make it compile. The main work here was in the scaffolding so that the ZeroMap traits know about "borrowed only versions" and how to switch back and forth between them.