perf(constants): remove top-level exported const enum

Because tree-shaking is not available if there are imported const enum and top-level execution pair

combinator.ts

@@ -34,13 +34,7 @@ import { NotValidator } from "./validators/operators/not.ts";
 import { OrValidator } from "./validators/operators/or.ts";
 import { TypeValidator } from "./validators/operators/typeof.ts";
 import { ValidDateValidator } from "./validators/date/valid_date.ts";
-import {
-  Error,
-  Int16Range,
-  Int32Range,
-  Int8Range,
-  UnsignedUpper,
-} from "./constants.ts";
+import { Error } from "./constants.ts";
 
 export function message(this: Display, { input }: { input: unknown }): string {
   return interpolate(Error.ShouldBeBut, [this, typeof input]);
@@ -136,27 +130,27 @@ export const unique = /* @__PURE__ */ new UniqueValidator().expect(({ item }) =>
 export const int = /* @__PURE__ */ new IntegerValidator().expect(shouldBeBut);
 export const int8 = /* @__PURE__ */ and(
   int,
-  /* @__PURE__ */ between(Int8Range.Bottom, Int8Range.Upper),
+  /* @__PURE__ */ between(-127, 128),
 );
 export const int16 = /* @__PURE__ */ and(
   int,
-  /* @__PURE__ */ between(Int16Range.Bottom, Int16Range.Upper),
+  /* @__PURE__ */ between(-32768, 32767),
 );
 export const int32 = /* @__PURE__ */ and(
   int,
-  /* @__PURE__ */ between(Int32Range.Bottom, Int32Range.Upper),
+  /* @__PURE__ */ between(-2147483648, 2147483647),
 );
 export const uint8 = /* @__PURE__ */ and(
   int,
-  /* @__PURE__ */ between(0, UnsignedUpper.Uint8),
+  /* @__PURE__ */ between(0, 255),
 );
 export const uint16 = /* @__PURE__ */ and(
   int,
-  /* @__PURE__ */ between(0, UnsignedUpper.Uint16),
+  /* @__PURE__ */ between(0, 65535),
 );
 export const uint32 = /* @__PURE__ */ and(
   int,
-  /* @__PURE__ */ between(0, UnsignedUpper.Unit32),
+  /* @__PURE__ */ between(0, 4294967295),
 );
 export const negative = /* @__PURE__ */ new NegativeNumberValidator().expect(
   shouldBeBut,

constants.ts

@@ -8,24 +8,3 @@ export const enum Error {
   MinCount = "item count should be greater than or equal to {0}, but {1}",
   Unique = "item(0) should be unique",
 }
-
-export const enum Int8Range {
-  Bottom = -127,
-  Upper = 128,
-}
-
-export const enum Int16Range {
-  Bottom = -32768,
-  Upper = 32767,
-}
-
-export const enum Int32Range {
-  Bottom = -2147483648,
-  Upper = 2147483647,
-}
-
-export const enum UnsignedUpper {
-  Uint8 = 255,
-  Uint16 = 65535,
-  Unit32 = 4294967295,
-}