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Before this change, writing files to an `nfsmount` via Finder on macOS would cause critical errors, rendering `nfsmount` effectively unusable on macOS. This change fixes the issue so that writes via Finder should be possible. The issue was primarily caused by the handler's HandleLimit being set to -1. -1 is the correct default for a NullAuthHandler, but not for a CachingHandler, which interprets -1 not as "no limit" but as "no cache". This change sets a high default of 1000000, and gives the user control over it with a new --nfs-cache-handle-limit flag (available in both `serve nfs` and `nfsmount`. A minimum of 5 is enforced, as any lower than this will be insufficient to support directory listing.