The compiler doesn't seem to prevent declaring two global properties with the same name. Is this by design or a bug?

I'm sorry, I mean global variables declared from the script. I find that in any script two global variable declarations compile with no errors.

double x;
double x;
void test() {

}

It doesn't look like there is any test for duplicate names in asCCompiler::CompileGlobalVariable.

as_compiler.cpp(1196):

asSExprContext compiledCtx(engine);
bool preCompiled = false;
if( gvar->datatype.IsAuto() )
	preCompiled = CompileAutoType(gvar->datatype, compiledCtx, node, gvar->declaredAtNode);
if( gvar->property == 0 )
{
	gvar->property = builder->module->AllocateGlobalProperty(gvar->name.AddressOf(), gvar->datatype, gvar->ns);
	gvar->index = gvar->property->id;
}

as_module.cpp(1175):

asCGlobalProperty *asCModule::AllocateGlobalProperty(const char *name, const asCDataType &dt, asSNameSpace *ns)
{
	asCGlobalProperty *prop = engine->AllocateGlobalProperty();
	prop->name = name;
	prop->nameSpace = ns;

	// Allocate the memory for this property based on its type
	prop->type = dt;
	prop->AllocateMemory();

	// Make an entry in the address to variable map
	engine->varAddressMap.Insert(prop->GetAddressOfValue(), prop);

	// Store the variable in the module scope (the reference count is already set to 1)
	scriptGlobals.Put(prop);

	return prop;
}