fix: default to polyfill

lib/toolbox.js

@@ -31,25 +31,25 @@ function isNode() {
 // Import webcrypto
 let webcrypto;
 const __setWebCrypto = async () => {
+	const usePolyfill = async () => {
+		return import("@peculiar/webcrypto").then(m => {
+			webcrypto = new m.Crypto();
+		});
+	}
+
 	if (isNode()) {
 		// Always use node webcrypto if available ( >= 16.0 )
 		return import("crypto").then(m => {
 			webcrypto = m.webcrypto;
-		}).catch(() => {
-			// Fallback to @peculiar/webcrypto
-			return import("@peculiar/webcrypto").then(m => {
-				webcrypto = new m.Crypto();
-			});
-		});
+		}).catch(usePolyfill);
 	}
 	if ((typeof self !== "undefined") && "crypto" in self) {
 		// Always use crypto if available natively (browser / Deno)
 		webcrypto = self.crypto;
 		return;
 	}
-	throw new Error("Environment is neither Node nor WebCrypto-enabled " +
-		"browser; no crypto support. If running on an older browser, consider " +
-		"using a WebCrypto polyfill.");
+	// Some environment without WebCrypto; use a polyfill
+	return usePolyfill();
 };
 let ready = __setWebCrypto();