simplify slice

Author: tinovyatkin

index.js

@@ -112,32 +112,9 @@ class Blob {
    * @param {string} [contentType]
    */
 	slice(start, end, contentType) {
-		const {size} = this;
-
-		let relativeStart;
-		let relativeEnd;
-
-		if (start === undefined) {
-			relativeStart = 0; //
-		} else if (start < 0) {
-			relativeStart = Math.max(size + start, 0); //
-		} else {
-			relativeStart = Math.min(start, size);
-		}
-
-		if (end === undefined) {
-			relativeEnd = size; //
-		} else if (end < 0) {
-			relativeEnd = Math.max(size + end, 0); //
-		} else {
-			relativeEnd = Math.min(end, size);
-		}
-
-		const span = Math.max(relativeEnd - relativeStart, 0);
-		const slicedBuffer = wm
+		return new Blob([wm
 			.get(this)
-			.buffer.slice(relativeStart, relativeStart + span);
-		return new Blob([slicedBuffer], {type: contentType});
+			.buffer.subarray(start, end)], {type: contentType});
 	}
 }