Skip single-byte buffer when reading through UrlSource for range request

src/source.ts

@@ -314,8 +314,10 @@ export class UrlSource extends Source {
 		} else if (rangeResponse.status === 200) {
 			// The server just returned the whole thing
 			this._fullData = await rangeResponse.arrayBuffer();
+			if (this._fullData.byteLength !== 1) {
 				return this._fullData.byteLength;
 			}
+		}
 
 		// If the range request didn't provide the size, make a full GET request
 		const { response } = await this._makeRequest();