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BREAKING CHANGE: `useBigInt64` deprecated from Encoder and > 32 bit ints now get encoded as a uint64 rather than float64

README.md

@@ -114,7 +114,6 @@ console.log(buffer);
 | ------------------- | -------------- | ----------------------------- |
 | extensionCodec      | ExtensionCodec | `ExtensionCodec.defaultCodec` |
 | context             | user-defined   | -                             |
-| useInt64            | boolean        | false                         |
 | forceBigIntToInt64  | boolean        | false                         |
 | maxDepth            | number         | `100`                         |
 | initialBufferSize   | number         | `2048`                        |
@@ -381,9 +380,9 @@ This library does not handle decoding BigInt by default, but you have three opti
 
 **Encoding**
 
-This library will encode a BigInt into a MessagePack int64/uint64 if it is > 32-bit OR you set `forceBigIntToInt64` to `true`. This library will encode a `number` that is > 32-bit into a MessagePack int64/uint64 if it is > 32-bit ONLY if you set `useInt64` to true, otherwise it encodes it as a MessagePack float64.
+This library will encode a BigInt into a MessagePack int64/uint64 if it is > 32-bit OR you set `forceBigIntToInt64` to `true`. This library will encode a `number` that is > 32-bit into a MessagePack int64/uint64 if it is > 32-bit.
 
-If you set `forceBigIntToInt64` to `true` the note:
+If you set `forceBigIntToInt64` to `true` note:
 
 - A bigint is encoded in 8 byte binaries even if it's a small integer
 - A bigint must be smaller than the max value of the uint64 and larger than the min value of the int64. Otherwise the behavior is undefined.

src/Decoder.ts

@@ -221,7 +221,7 @@ export class Decoder<ContextType = undefined> {
     this.extensionCodec = options?.extensionCodec ?? (ExtensionCodec.defaultCodec as ExtensionCodecType<ContextType>);
     this.context = (options as { context: ContextType } | undefined)?.context as ContextType; // needs a type assertion because EncoderOptions has no context property when ContextType is undefined
 
-    this.intMode = options?.intMode ?? options?.useBigInt64 ? IntMode.AS_ENCODED : IntMode.UNSAFE_NUMBER;
+    this.intMode = options?.intMode ?? (options?.useBigInt64 ? IntMode.AS_ENCODED : IntMode.UNSAFE_NUMBER);
     this.maxStrLength = options?.maxStrLength ?? UINT32_MAX;
     this.maxBinLength = options?.maxBinLength ?? UINT32_MAX;
     this.maxArrayLength = options?.maxArrayLength ?? UINT32_MAX;

src/Encoder.ts

@@ -1,9 +1,9 @@
 import { utf8Count, utf8Encode } from "./utils/utf8";
 import { ExtensionCodec, ExtensionCodecType } from "./ExtensionCodec";
+import { setInt64, setUint64 } from "./utils/int";
 import { ensureUint8Array } from "./utils/typedArrays";
 import type { ExtData } from "./ExtData";
 import type { ContextOf } from "./context";
-import { setInt64, setUint64 } from "./utils/int";
 
 export const DEFAULT_MAX_DEPTH = 100;
 export const DEFAULT_INITIAL_BUFFER_SIZE = 2048;
@@ -12,13 +12,6 @@ export type EncoderOptions<ContextType = undefined> = Partial<
   Readonly<{
     extensionCodec: ExtensionCodecType<ContextType>;
 
-    /**
-     * Encodes a `number` greater than 32-bit as Int64 or Uint64 if it's set to true, otherwise encode as float64.
-     *
-     * Defaults to false.
-     */
-    useInt64: boolean;
-
     /**
      * Encodes bigint as Int64 or Uint64 if it's set to true, regardless of the size of bigint number.
      * {@link forceIntegerToFloat} does not affect bigint.
@@ -29,9 +22,6 @@ export type EncoderOptions<ContextType = undefined> = Partial<
      */
     forceBigIntToInt64: boolean;
 
-    /** @deprecated Alias of `forceBigIntToInt64` */
-    useBigInt64: boolean;
-
     /**
      * The maximum depth in nested objects and arrays.
      *
@@ -86,7 +76,6 @@ export class Encoder<ContextType = undefined> {
   private readonly extensionCodec: ExtensionCodecType<ContextType>;
   private readonly context: ContextType;
   private readonly forceBigIntToInt64: boolean;
-  private readonly useInt64: boolean;
   private readonly maxDepth: number;
   private readonly initialBufferSize: number;
   private readonly sortKeys: boolean;
@@ -102,8 +91,7 @@ export class Encoder<ContextType = undefined> {
     this.extensionCodec = options?.extensionCodec ?? (ExtensionCodec.defaultCodec as ExtensionCodecType<ContextType>);
     this.context = (options as { context: ContextType } | undefined)?.context as ContextType; // needs a type assertion because EncoderOptions has no context property when ContextType is undefined
 
-    this.forceBigIntToInt64 = options?.forceBigIntToInt64 ?? options?.useBigInt64 ?? false;
-    this.useInt64 = options?.useInt64 ?? false;
+    this.forceBigIntToInt64 = options?.forceBigIntToInt64 ?? false;
     this.maxDepth = options?.maxDepth ?? DEFAULT_MAX_DEPTH;
     this.initialBufferSize = options?.initialBufferSize ?? DEFAULT_INITIAL_BUFFER_SIZE;
     this.sortKeys = options?.sortKeys ?? false;
@@ -150,15 +138,9 @@ export class Encoder<ContextType = undefined> {
     } else if (typeof object === "boolean") {
       this.encodeBoolean(object);
     } else if (typeof object === "number") {
-      if (!this.forceIntegerToFloat) {
-        this.encodeNumber(object);
-      } else {
-        this.encodeNumberAsFloat(object);
-      }
+      this.encodeNumber(object);
     } else if (typeof object === "string") {
       this.encodeString(object);
-    } else if (this.forceBigIntToInt64 && typeof object === "bigint") {
-      this.encodeBigIntAsInt64(object);
     } else {
       this.encodeObject(object, depth);
     }
@@ -213,12 +195,10 @@ export class Encoder<ContextType = undefined> {
           // uint 32
           this.writeU8(0xce);
           this.writeU32(object);
-        } else if (this.useInt64) {
+        } else {
           // uint 64
           this.writeU8(0xcf);
           this.writeU64(object);
-        } else {
-          this.encodeNumberAsFloat(object);
         }
       } else {
         if (object >= -0x20) {
@@ -236,12 +216,10 @@ export class Encoder<ContextType = undefined> {
           // int 32
           this.writeU8(0xd2);
           this.writeI32(object);
-        } else if (this.useInt64) {
+        } else {
           // int 64
           this.writeU8(0xd3);
           this.writeI64(object);
-        } else {
-          this.encodeNumberAsFloat(object);
         }
       }
     } else {
@@ -262,7 +240,9 @@ export class Encoder<ContextType = undefined> {
   }
 
   private encodeBigInt(object: bigint) {
-    if (object >= 0) {
+    if (this.forceBigIntToInt64) {
+      this.encodeBigIntAsInt64(object);
+    } else if (object >= 0) {
       if (object < 0x100000000 || this.forceIntegerToFloat) {
         // uint 32 or lower, or force to float
         this.encodeNumber(Number(object));

test/bigint64.test.ts

@@ -1,6 +1,6 @@
 import assert from "assert";
 import { encode, decode, IntMode, ExtensionCodec, DecodeError } from "../src";
-import { getInt64, getUint64 } from "src/utils/int";
+import { getInt64, getUint64 } from "../src/utils/int";
 
 describe("useBigInt64: true", () => {
   before(function () {
@@ -27,14 +27,25 @@ describe("useBigInt64: true", () => {
     assert.deepStrictEqual(decode(encoded, { useBigInt64: true }), value);
   });
 
-  it("encodes and decodes values with numbers and bigints", () => {
+  it("encodes and decodes values with numbers and bigints - MIXED", () => {
     const value = {
       ints: [0, Number.MAX_SAFE_INTEGER, Number.MIN_SAFE_INTEGER],
       nums: [Number.NaN, Math.PI, Math.E, Number.POSITIVE_INFINITY, Number.NEGATIVE_INFINITY],
+      bigints: [BigInt(Number.MAX_SAFE_INTEGER) + BigInt(1), BigInt(Number.MIN_SAFE_INTEGER) - BigInt(1)],
+    };
+    const encoded = encode(value, { forceBigIntToInt64: true });
+    const decoded = decode(encoded, { intMode: IntMode.MIXED });
+    assert.deepStrictEqual(decoded, value);
+  });
+
+  it("encodes and decodes values with numbers and bigints - AS_ENCODED", () => {
+    const value = {
+      ints: [0, Math.pow(2, 32) - 1, -1 * Math.pow(2, 31)],
+      nums: [Number.NaN, Math.PI, Math.E, Number.POSITIVE_INFINITY, Number.NEGATIVE_INFINITY],
       bigints: [BigInt(0), BigInt(Number.MAX_SAFE_INTEGER) + BigInt(1), BigInt(Number.MIN_SAFE_INTEGER) - BigInt(1)],
     };
     const encoded = encode(value, { forceBigIntToInt64: true });
-    const decoded = decode(encoded, { useBigInt64: true });
+    const decoded = decode(encoded, { intMode: IntMode.AS_ENCODED });
     assert.deepStrictEqual(decoded, value);
   });
 });