fix: remove object case

src/cmap/handshake/client_metadata.ts

@@ -249,7 +249,7 @@ declare const Deno: { version?: { deno?: string } } | undefined;
  * expect it to satisfy. In order to not ship code in the driver that would break
  * future versions of this runtime assume all properties are nullish.
  */
-declare const Bun: { version?: string } | undefined;
+declare const Bun: { (): void; version?: string } | undefined;
 
 /**
  * @internal
@@ -278,7 +278,7 @@ function getRuntimeInfo(): string {
   if ('Bun' in globalThis) {
     const version =
       Bun != null &&
-      (typeof Bun === 'function' || typeof Bun === 'object') &&
+      typeof Bun === 'function' &&
       'version' in Bun &&
       typeof Bun.version === 'string'
         ? Bun.version

test/unit/cmap/handshake/client_metadata.test.ts

@@ -344,18 +344,10 @@ describe('client metadata module', () => {
           expect(delete globalThis.Bun, 'failed to delete Bun global').to.be.true;
         });
 
-        it('sets platform to Bun if typeof is object', () => {
-          globalThis.Bun = { version: '1.2.3' };
-          const metadata = makeClientMetadata({ driverInfo: {} });
-          expect(metadata.platform).to.equal('Bun v1.2.3, LE');
-        });
-
-        it('sets platform to Bun if typeof is function', () => {
-          function Bun() {
-            return null;
-          }
-          Bun.version = '1.2.3';
-          globalThis.Bun = Bun;
+        it('sets platform to Bun', () => {
+          globalThis.Bun = class {
+            static version = '1.2.3';
+          };
           const metadata = makeClientMetadata({ driverInfo: {} });
           expect(metadata.platform).to.equal('Bun v1.2.3, LE');
         });