diff --git a/deno.json b/deno.json
index 741af34..2cf2989 100644
--- a/deno.json
+++ b/deno.json
@@ -1,6 +1,6 @@
 {
   "name": "@olli/kvdex",
-  "version": "3.1.1",
+  "version": "3.1.2",
   "exports": {
     ".": "./mod.ts",
     "./zod": "./src/ext/zod/mod.ts",
diff --git a/src/collection.ts b/src/collection.ts
index dfa0089..52d23e7 100644
--- a/src/collection.ts
+++ b/src/collection.ts
@@ -1,7 +1,7 @@
 import type {
   BuilderFn,
   CheckKeyOf,
-  CollectionKeys,
+  CollectionInternals,
   CollectionOptions,
   CommitResult,
   DenoKv,
@@ -10,14 +10,12 @@ import type {
   DenoKvEntryMaybe,
   DenoKvStrictKey,
   EncodedEntry,
-  Encoder,
   EnqueueOptions,
   FindManyOptions,
   FindOptions,
   HandleOneOptions,
   HistoryEntry,
   IdempotentListener,
-  IdGenerator,
   IdUpsert,
   IndexDataEntry,
   KvId,
@@ -155,16 +153,7 @@ export class Collection<
   private idempotentListener: IdempotentListener;
 
   /** Used for internal workings, do not manipulate or rely on these properties. */
-  readonly 一internal: {
-    readonly model: Model<TInput, TOutput>;
-    readonly primaryIndexList: string[];
-    readonly secondaryIndexList: string[];
-    readonly keys: CollectionKeys;
-    readonly idGenerator: IdGenerator<TOutput, ParseId<TOptions>>;
-    readonly encoder?: Encoder;
-    readonly isIndexable: boolean;
-    readonly keepsHistory: boolean;
-  };
+  readonly 一internal: CollectionInternals<TInput, TOutput, TOptions>;
 
   constructor(
     kv: DenoKv,
diff --git a/src/types.ts b/src/types.ts
index 35af534..7f4f004 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -286,6 +286,22 @@ export type AtomicSetOptions<T extends CollectionOptions<any>> =
 /*                      */
 /************************/
 
+/** Used for internal workings, do not manipulate or rely on these properties. */
+export type CollectionInternals<
+  TInput,
+  TOutput extends KvValue,
+  TOptions extends CollectionOptions<TOutput>,
+> = {
+  readonly model: Model<TInput, TOutput>;
+  readonly primaryIndexList: string[];
+  readonly secondaryIndexList: string[];
+  readonly keys: CollectionKeys;
+  readonly idGenerator: IdGenerator<TOutput, ParseId<TOptions>>;
+  readonly encoder?: Encoder;
+  readonly isIndexable: boolean;
+  readonly keepsHistory: boolean;
+};
+
 /** Options for creating a new collection */
 export type CollectionOptions<T extends KvValue> =
   & {