fix(core): Normalize binary data handling across registries and add buffer helpers

ts/maven/classes.mavenregistry.ts

@@ -7,6 +7,7 @@ import { BaseRegistry } from '../core/classes.baseregistry.js';
 import type { RegistryStorage } from '../core/classes.registrystorage.js';
 import type { AuthManager } from '../core/classes.authmanager.js';
 import type { IRequestContext, IResponse, IAuthToken } from '../core/interfaces.core.js';
+import { toBuffer } from '../core/helpers.buffer.js';
 import type { IMavenCoordinate, IMavenMetadata, IChecksums } from './interfaces.maven.js';
 import {
   pathToGAV,
@@ -296,7 +297,7 @@ export class MavenRegistry extends BaseRegistry {
     coordinate: IMavenCoordinate,
     body: Buffer | any
   ): Promise<IResponse> {
-    const data = Buffer.isBuffer(body) ? body : Buffer.from(JSON.stringify(body));
+    const data = toBuffer(body);
 
     // Validate POM if uploading .pom file
     if (coordinate.extension === 'pom') {