type_name(av)=i64
type_is_unsigned(av)=false
print(av)=6
type_name(au)=u32
type_is_unsigned(au)=true
print(au)=7
type_name(sv)=string
type_name(at)=u64
type_is_unsigned(at)=true
print(at)=u64
type_is_unsigned(type_of(x))=true
