Test1
{{Merging|param2|...|demospace=0 |name3=value3}}

{{Merging}}

{{Merging/sandbox}}

Test2
{{Merging|param2|...|demospace=main |name3=value3}}

{{Merging}}

{{Merging/sandbox}}

Test3
{{Merging|param2|...|demospace=yes |name3=value3}}

{{Merging}}

{{Merging/sandbox}}