fix is_number fallback check

Author: lord-ruby

manipulate.lua

@@ -187,6 +187,7 @@ function Cryptid.manipulate_table(card, ref_table, ref_value, args, tblkey)
 end
 
 function Cryptid.manipulate_value(num, args, is_big, name)
+	if not Cryptid.is_number(num) then return end
 	if args.func then
 		num = args.func(num, args, is_big, name)
 	else

talisman.lua

@@ -108,5 +108,5 @@ if SMODS and SMODS.Mods and not (SMODS.Mods.Talisman or SMODS.Mods.cdataman or {
 	to_big = to_big or function(x) return x end
 	to_number = to_number or function(x) return x end
 	lenient_bignum = lenient_bignum or function(x) return x end
-	is_number = is_number or function(x) return x end
+	is_number = is_number or function(x) return type(x) == "number" end
 end