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Specifies that this object is not linkable. This is only intended to be used in the context of creating a temporary unnamed objects. When that is not the case, the node protocol defines if it is linkable (i.e. if it composes the `Linkable` protocol). When this flag is set along with `Flags.FLAG_CREATE_AS_UNNAMED_TEMPORARY`, an unnamed temporary object will be created that cannot be linked into the filesystem. This would be similar to Linux `O_TMPFILE | O_EXCL`. CAUTION: if `Flags.FLAG_CREATE_AS_UNNAMED_TEMPORARY` is not specified, then this is treated as a "must create" flag. The reason for overloading `Flags.FLAG_MUST_CREATE` to mean "not linkable" in this context and "must create" in other contexts is due to the assumption that some POSIX flags are compatible with the members in `Flags`. In particular the POSIX `O_EXCL` has the same value as `Flags.FLAG_MUST_CREATE`. We are not able to define different bit members of the same value, hence it is defined separately outside of `Flags`.