unexpected Uint8Array.prototype.buffer behavior

[septs]

buf = new Uint8Array(2048)
buf.subarray(0, 670).buffer
// ArrayBuffer(2048)
buf.slice(0, 670).buffer
// ArrayBuffer(670)

msgpack-javascript/src/Encoder.ts

Lines 26 to 28 in 0bfe618

	private getUint8Array(): Uint8Array {
	return this.bytes.subarray(0, this.pos);
	}

References:
DimensionDev/Maskbook#1573

[Jack-Works]

slice might copy the buffer then affect the performance

[gfx]

As @Jack-Works said, it is intentional.

It's not specific to this library. In JavaScript and TypeScript, You MUST NOT use the underlying buffer in typed arrays without offset and length. Typed arrays and DataView are a view to ArrayBuffer. In addition, I don't recommend to copy typed arrays and their underlying buffers unless they are mutable. Copying buffers affects the performance.