diff --git a/bun.lockb b/bun.lockb
index f65e392..168faa4 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/package.json b/package.json
index f066f24..808c720 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@thilawyn/thilalib",
-  "version": "0.1.3",
+  "version": "0.1.4",
   "type": "module",
   "files": [
     "./dist"
@@ -46,11 +46,11 @@
     "clean:node": "rm -rf node_modules"
   },
   "dependencies": {
-    "remeda": "^2.2.0",
+    "remeda": "^2.2.1",
     "type-fest": "^4.20.1"
   },
   "devDependencies": {
-    "bun-types": "^1.1.16",
+    "bun-types": "^1.1.17",
     "npm-check-updates": "^16.14.20",
     "npm-sort": "^0.0.4",
     "tsup": "^8.1.0",
@@ -58,8 +58,8 @@
     "typescript": "^5.5.2"
   },
   "optionalDependencies": {
-    "@effect/schema": "^0.68.9",
-    "effect": "^3.4.2",
+    "@effect/schema": "^0.68.12",
+    "effect": "^3.4.5",
     "mobx": "^6.12.4"
   }
 }
diff --git a/src/effect/schema/Jsonifiable.ts b/src/effect/schema/Jsonifiable.ts
index 26c19b2..e426a20 100644
--- a/src/effect/schema/Jsonifiable.ts
+++ b/src/effect/schema/Jsonifiable.ts
@@ -2,12 +2,38 @@ import { Schema as S } from "@effect/schema"
 import type * as TF from "type-fest"
 
 
+// export function Jsonifiable<
+//     A, I, R,
+//     JsonifiableA extends I, JsonifiableI extends TF.Jsonifiable, JsonifiableR,
+// >(
+//     schema:       S.Schema<A, I, R>,
+//     jsonifiable:  S.Schema<JsonifiableA, JsonifiableI, JsonifiableR>,
+// ) {
+//     return jsonifiable.pipe(S.compose(schema))
+// }
+
+// export function Jsonifiable<A, I, R>(
+//     schema: S.Schema<A, I, R>
+// ) {
+//     return <
+//         JsonifiableA extends I,
+//         JsonifiableI extends TF.Jsonifiable,
+//         JsonifiableR,
+//     >(
+//         jsonifiable: S.Schema<JsonifiableA, JsonifiableI, JsonifiableR>
+//     ) =>
+//         jsonifiable.pipe(S.compose(schema))
+// }
+
 export function Jsonifiable<
-    A, I, R,
-    JsonifiableA extends I, JsonifiableI extends TF.Jsonifiable, JsonifiableR,
+    JsonifiableA,
+    JsonifiableI extends TF.Jsonifiable,
+    JsonifiableR,
 >(
-    schema:       S.Schema<A, I, R>,
-    jsonifiable:  S.Schema<JsonifiableA, JsonifiableI, JsonifiableR>,
+    jsonifiable: S.Schema<JsonifiableA, JsonifiableI, JsonifiableR>
 ) {
-    return jsonifiable.pipe(S.compose(schema))
+    return <A, R>(
+        schema: S.Schema<A, JsonifiableA, R>
+    ) =>
+        jsonifiable.pipe(S.compose(schema))
 }
diff --git a/src/effect/schema/Kind.ts b/src/effect/schema/Kind.ts
new file mode 100644
index 0000000..3f6748a
--- /dev/null
+++ b/src/effect/schema/Kind.ts
@@ -0,0 +1,9 @@
+import { Schema as S } from "@effect/schema"
+
+
+export function Kind<Kind extends string>(kind: Kind) {
+    return S.withConstructorDefault(
+        S.propertySignature(S.Literal(kind)),
+        () => kind,
+    )
+}
diff --git a/src/effect/schema/class/MobXObservable.ts b/src/effect/schema/class/MobXObservable.ts
index cc47903..f967df0 100644
--- a/src/effect/schema/class/MobXObservable.ts
+++ b/src/effect/schema/class/MobXObservable.ts
@@ -3,18 +3,16 @@ import { makeObservable, observable, type CreateObservableOptions } from "mobx"
 import { mapValues } from "remeda"
 
 
-interface MobXObservableInput {
+interface MobXObservableA {
     new(...args: any[]): S.Struct.Type<S.Struct.Fields>
     readonly fields: { readonly [K in keyof S.Struct.Fields]: S.Struct.Fields[K] }
 }
 
-export function MobXObservable<
-    This extends MobXObservableInput
->(
-    class_:    This,
+export function MobXObservable<A extends MobXObservableA>(
+    self:      A,
     options?:  Omit<CreateObservableOptions, "proxy">,
 ) {
-    return class MobXObservable extends class_ {
+    return class MobXObservable extends self {
         declare ["constructor"]: typeof MobXObservable
 
         constructor(...args: any[]) {
@@ -25,5 +23,5 @@ export function MobXObservable<
                 options,
             )
         }
-    } as This
+    } as A
 }
diff --git a/src/effect/schema/index.ts b/src/effect/schema/index.ts
index 2275c31..e4b52a0 100644
--- a/src/effect/schema/index.ts
+++ b/src/effect/schema/index.ts
@@ -1,2 +1,3 @@
 export { Jsonifiable } from "./Jsonifiable"
+export { Kind } from "./Kind"
 export { Tag } from "./Tag"
diff --git a/src/effect/schema/class/tests.ts b/src/effect/schema/tests.ts
similarity index 56%
rename from src/effect/schema/class/tests.ts
rename to src/effect/schema/tests.ts
index 859af98..0e9f692 100644
--- a/src/effect/schema/class/tests.ts
+++ b/src/effect/schema/tests.ts
@@ -1,18 +1,24 @@
 import { Schema as S } from "@effect/schema"
 import { reaction, runInAction } from "mobx"
-import { pipe } from "remeda"
-import { MobXObservable } from "./MobXObservable"
-import { MutableTaggedClass } from "./MutableTaggedClass"
+import { Jsonifiable } from "./Jsonifiable"
+import { MobXObservable, MutableTaggedClass } from "./class"
 
 
-class User extends pipe(
-    MutableTaggedClass<User>()("User", {
-        id: S.BigIntFromSelf,
-        role: S.Union(S.Literal("BasicUser"), S.Literal("Admin")),
-    }),
-    MobXObservable,
+class User extends MutableTaggedClass<User>()("User", {
+    id:    S.BigIntFromSelf,
+    role:  S.Union(S.Literal("BasicUser"), S.Literal("Admin")),
+}).pipe(
+    MobXObservable
 ) {}
 
+const JsonifiableUser = User.pipe(
+    Jsonifiable(S.Struct({
+        ...User.fields,
+        id: S.BigInt,
+    }))
+)
+
+
 const user1 = new User({ id: -1n, role: "BasicUser" })
 reaction(() => user1.id, id => console.log(`user1 id changed: ${ id }`))