Creates a new tuple Variant out of the items in children.
The type is determined from the types of children. No entry in the children array may be
null.
If children.length is 0 then the unit tuple is constructed.
If the children are floating references (see g_variant_ref_sink), the new instance takes ownership of them as
if via g_variant_ref_sink.
| children |
the items to make the tuple out of |
| n_children |
the length of |
|
a floating reference to a new Variant tuple |