ab
a1
1a
12
1.5x
false	concat_typecheck:12: attempt to perform arithmetic
false	concat_typecheck:13: attempt to perform arithmetic
false	concat_typecheck:14: attempt to perform arithmetic
false	concat_typecheck:15: attempt to perform arithmetic
false	concat_typecheck:16: attempt to perform arithmetic
false	concat_typecheck:17: attempt to perform arithmetic
nil
true	nil	false
table: 0x3	nil