breaking change. it works better.

tests/priority.ts

@@ -0,0 +1,28 @@
+import Logging, { LoggingConfiguration } from "@proxnet/undead-logging";
+
+class CustomError extends Error {
+
+    someProperty: string
+
+    constructor(someProp: string) {
+        super("Something went wrong.");
+        this.someProperty = someProp;
+    }
+
+}
+
+LoggingConfiguration.clearConversions();
+LoggingConfiguration.addConversion<CustomError>({
+    condition: arg => arg instanceof CustomError,
+    converter: arg => `CustomError: someProperty:${arg.someProperty}; ${arg.stack || arg.message}`,
+    priority: -1
+});
+LoggingConfiguration.addConversion<Error>({
+    condition: arg => arg instanceof Error,
+    converter: arg => `Error: ${arg.stack || arg.message}`,
+    priority: 1
+});
+
+const log = new Logging("PriorityTest");
+
+log.i(new CustomError("'Hello World!'"));