新增权重随机相关函数

util/typedef/type.go

@@ -0,0 +1,25 @@
+package typedef
+
+type Signed interface {
+	~int | ~int8 | ~int16 | ~int32 | ~int64
+}
+
+type Unsigned interface {
+	~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64
+}
+
+type Float interface {
+	~float32 | ~float64
+}
+
+type Integer interface {
+	Signed|Unsigned
+}
+
+type Number interface {
+	Signed|Unsigned
+}
+
+type Ordered interface {
+	Number|Float|~string
+}