diff --git a/src/logger.ts b/src/logger.ts
index 8cdff06..572f3a3 100644
--- a/src/logger.ts
+++ b/src/logger.ts
@@ -108,10 +108,13 @@ export class Logger extends Filterer {
 
     public set level(level: LogLevel) { this._level = checkLevel(level) }
 
+    public get manager(): Manager|null { return this._manager }
+
     public set manager(manager: Manager) {
-        if (this.manager) {
+        if (this._manager) {
             throw new ValueError('logger can only be assigned to manager once');
         }
+        this._manager = manager;
     }
 
     public setLevel(level: LogLevel) {
@@ -143,13 +146,17 @@ export class Logger extends Filterer {
     public isEnabledFor(level: LogLevel): boolean {
         if (this.disabled) { return false }
 
-        if (this.cache[level] === undefined && this.manager && this.manager.disable < level) {
-            return this.cache[level] = (
-                level >= this.getEffectiveLevel()
-            );
+        if (level in this.cache) {
+            return this.cache[level];
         }
 
-        return this.cache[level] = false;
+        if (this._manager && this._manager.disable >= level) {
+            this.cache[level] = false;
+            return false;
+        }
+
+        this.cache[level] = level >= this.getEffectiveLevel();
+        return this.cache[level];
     }
 
     /**
@@ -191,9 +198,9 @@ export class Logger extends Filterer {
 
                 var [k, v] = item;
 
-                if (['message', 'asctime'].includes(k as string) ||
-                    (rv as {[key: string]: any}).keys().includes(k as string)) {
-                    throw new KeyError('attempt to overwrite ${k} in LogRecord')
+                if (['message', 'asctime'].includes(k) ||
+                    Object.keys(rv).includes(k)) {
+                    throw new KeyError(`attempt to overwrite ${k} in LogRecord`)
                 }
 
                 (rv as any)[k] = options.extra![k as string] as any
@@ -226,7 +233,8 @@ export class Logger extends Filterer {
             }
         }
 
-        var record = this.makeRecord(this.scope, level, msg, options)
+        const record = this.makeRecord(this.scope, level, msg, options);
+        this.handle(this.scope, record);
     }
 
     /**