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* A new function `builtins.readFileType` is available. It is similar to
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`builtins.readDir` but acts on a single file or directory.
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* The `builtins.readDir` function has been optimized when encountering unknown
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* The `builtins.readDir` function has been optimized when encountering not-yet-known
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file types from POSIX's `readdir`. In such cases the type of each file is/was
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discovered by making multiple syscalls. This change makes these operations
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lazy such that these lookups will only be performed if the attribute is used.
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This optimization effects a minority of filesystems and operating systems.
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This optimization affects a minority of filesystems and operating systems.
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