Fix cross-filesystem operations in MountFileSystem #95
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While looking at #94, I saw a possible issue with MountFileSystem. It's possible for the MountFileSystem to not have a fallback filesystem, causing
ResolvePathto throw an InvalidOperationException. The change in ComposeFileSystem fixes this problem.After that I've implemented
ResolvePathImplin MountFileSystem, so it'll also use the move when theMountFileSystemisn't used directly, e.g.:zio/src/Zio.Tests/FileSystems/TestMemoryFileSystem.cs
Line 107 in 574a76d