Improve argument type checking.

src/test/res/mathlib.lua

@@ -4,6 +4,8 @@ print( math.sqrt( 9.0 ) )
 print( math.modf( 5.25 ) )
 
 local aliases = {
+	['0']='<zero>',
+	['-0']='<zero>',
 	['nan']='<nan>',
 	['inf']='<pos-inf>',
 	['-inf']='<neg-inf>',

src/test/res/module.lua

@@ -1,3 +1,5 @@
+
+
 -- unit tests for module() function
 local ids = {}
 local function id(obj)
@@ -72,3 +74,17 @@ f()
 print( a )
 print( getfenv(f)['a'] )
 print( a )
+
+-- do metatables work with package.loaded and require? 
+print( 'setting metatable for package.loaded' )
+print( 'package.loaded.mypreload', package.loaded.mypreload )
+print( 'setmetatable') 
+pcall( setmetatable, package.loaded, { __index={mypreload=12345}})
+print( 'package.loaded.mypreload', package.loaded.mypreload )
+print( "require, 'mypreload'", pcall( require, 'mypreload' ) )
+print( 'package.loaded.mypreload', package.loaded.mypreload )
+print( 'resetting metatable for package.loaded' )
+print( 'setmetatable') 
+pcall( setmetatable, package.loaded, nil )
+print( "require, 'mypreload'", (pcall( require, 'mypreload' )) )
+print( 'package.loaded.mypreload', package.loaded.mypreload )

src/test/res/pcalls.lua

@@ -20,6 +20,13 @@ local function ct(f,a,b,c)
 	return f(a,b,c)
 end
 
+-- wrap pcall to be more useful in testing
+local pc = pcall
+local pcall = function(...)
+	local s,c = pc(...)
+	return s, type(c)
+end
+
 -- lua calls
 print( 'lc(22,33,44)', lc(22,33,44) )
 print( 'pcall(lc,22,33,44)', pcall(lc,22,33,44) )
@@ -50,3 +57,4 @@ for i = 0,4 do
 	print( 'pcall(le,i)', i, pcall(le,i) )
 	print( 'pcall(ge,i)', i, pcall(ge,i) )
 end
+