a912a2784b
Since range types can be created by non-superusers, we need to consider their permissions. Ideally we'd check this when the type is used, not when it's created, but that seems like much more trouble than it's worth. The existing restriction that the support functions be immutable already prevents most cases where an unauthorized call to a function might be thought a security issue, and the fact that the user has no access to the results of the system's calls to subtype_diff closes off the other plausible reason for concern. So this check is basically pro-forma, but let's make it anyway.
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