Never encode binary metadata within the metadata map #1188
Merged
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This change ensures consistency for the user when accessing metadata values: they are never encoded except when sent on the wire. Previously, they would appear encoded to client code, but not to server code. As such, this represents a behavior change, but one unlikely to affect user code, as it's unusual to inspect the metadata after setting it.
Fixes the remaining aspect of #1148 not fixed by #1157.