bugfix in module library and new class encapsulation

libs/module.lua

@@ -12,11 +12,11 @@ local function error(msg, ...) return _G.error(format(msg or '', unpack(arg)) ..
 
 local nop, id = function() end, function(v) return v end
 
-local interface_eq = function() return true end
-local INTERFACE = setmetatable({}, { __eq=interface_eq })
+local interface_lt = function() return true end
+local INTERFACE = setmetatable({}, { __lt=interface_lt })
 
-local function proxy_mt(fields, mutators, eq)
-	return { __metatable=false, __index=fields, __newindex=function(_, k, v) return mutators[k](v) end, __eq=eq }
+local function proxy_mt(fields, mutators, lt)
+	return { __metatable=false, __index=fields, __newindex=function(_, k, v) return mutators[k](v) end, __lt=lt }
 end
 
 local _module, _modifiers = {}, {}
@@ -38,7 +38,7 @@ function definition_helper_mt:__newindex(k, v) local module, modifiers = _module
 end
 
 local function import(self, interface)
-	local module = (interface == INTERFACE or error'Import error.') and _module[interface]
+	local module = (interface < INTERFACE or error'Import error.') and _module[interface]
 	for _, type in TYPES do
 		for k, v in module[PUBLIC+type] do
 			if not self.defined[k .. OPERATION[type]] then
@@ -65,7 +65,7 @@ function global_mt:__index(key)
 	public_mutators = setmetatable({}, nop_default_mt)
 	public_fields = setmetatable({}, { __index=function(_, key) return public_accessors[key]() end })
 	setmetatable(environment, proxy_mt(fields, mutators))
-	setmetatable(interface, proxy_mt(public_fields, public_mutators, interface_eq))
+	setmetatable(interface, proxy_mt(public_fields, public_mutators, interface_lt))
 	module = {
 		defined = { _E=true, _I=true, _G=true, import=true, error=true, nop=true, id=true, public=true, private=true, ['_=']=true },
 		[ACCESSOR] = accessors,