First support 1.21.130

internal/item/schemas/0251_1.21.100.23_beta_to_1.21.110.26_beta.json

@@ -0,0 +1,5 @@
+{
+    "renamedIds": {
+        "minecraft:chain": "minecraft:iron_chain"
+    }
+}

internal/typeconf/types.go

@@ -0,0 +1,40 @@
+package typeconf
+
+import (
+	"fmt"
+	"github.com/samber/lo"
+)
+
+func StringToInt[T ~uint8 | ~int8 | ~uint16 | ~int16 | ~uint32 | ~int32 | ~uint64 | ~int64](s string, fallback int) T {
+	var result T
+	_, err := fmt.Sscanf(s, "%d", &result)
+	if err != nil {
+		return T(fallback)
+	}
+	return result
+}
+
+func IntToString[T ~uint8 | ~int8 | ~uint16 | ~int16 | ~uint32 | ~int32 | ~uint64 | ~int64](i T, fallback string) string {
+	return fmt.Sprintf("%d", i)
+}
+
+func BoolToByte(b bool) byte {
+	if b {
+		return 1
+	}
+	return 0
+}
+
+func ByteToBool(b byte) bool {
+	return b != 0
+}
+
+func IntToInt[T1 ~uint8 | ~int8 | ~uint16 | ~int16 | ~uint32 | ~int32 | ~uint64 | ~int64, T2 ~uint8 | ~int8 | ~uint16 | ~int16 | ~uint32 | ~int32 | ~uint64 | ~int64](i T1) T2 {
+	return T2(i)
+}
+
+func SliceIntToSliceInt[T1 ~uint8 | ~int8 | ~uint16 | ~int16 | ~uint32 | ~int32 | ~uint64 | ~int64, T2 ~uint8 | ~int8 | ~uint16 | ~int16 | ~uint32 | ~int32 | ~uint64 | ~int64](in []T1) []T2 {
+	return lo.Map(in, func(i T1, _ int) T2 {
+		return T2(i)
+	})
+}