Function pxs_tostring 

#[unsafe(no_mangle)]
pub extern "C" fn pxs_tostring(
    runtime: *mut pxs_Var,
    var: *mut pxs_Var,
) -> *mut pxs_Var

Call a ToString method on this Var. If already a string, it won’t call it.

Host must free this memory with pxs_free_var