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+Aliases:
+	from a local file, kinda like requirements.txt, maps name to hash,
+	either package/module name, or an author/public key name.
+
+Example:
+from cas.a.jmg.utils import aiter, anext
+
+Make sure that when an alias is used, that the same module is returned when a
+direct hash import is used.
+
+Local cache:
+	if a directory like ~/.cas_cache exists, use it's contents automatically,
+	and if it's writable, write any network fetched imported data to it.