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FileCache should either reject or consistently fix keys that conflict as filepaths #58
Description
Currently the library allows you to specify invalid Windows filepaths as keys, for example:
var cache = new FileCache(".");
cache.Add("foo", "foo", DateTimeOffset.Now.AddMinutes(1));
cache.Get("foo").Dump(); // Returns "foo"
cache.Get("foo.bar").Dump(); // Also returns "foo", because the key is truncated, should return null
cache.Add(@"foo\bar", @"foo\bar", DateTimeOffset.Now.AddMinutes(1));
cache.Get(@"foo\bar").Dump(); // Returns "foo\bar"
cache.Get(@"bar").Dump(); // Also returns "foo\bar", should return null.I'd propose that either the library should reject these as keys (if the input string != the filename), or IMO better yet it should transform them to be eligible paths. Though in this case, care must be taken so that the transformed paths don't conflict with other non-transformed keys.
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