diff --git a/src/Teller.php b/src/Teller.php
index 2068c3e..5251406 100644
--- a/src/Teller.php
+++ b/src/Teller.php
@@ -15,11 +15,9 @@
  */
 namespace Aviat\Banker;
 
-use Aviat\Banker\Exception\InvalidArgumentException;
 use DateInterval;
 use Psr\Log\{LoggerInterface, LoggerAwareInterface};
 use Psr\SimpleCache;
-use TypeError;
 
 /**
  * Implements PSR-16 (SimpleCache)
@@ -65,16 +63,11 @@ class Teller implements LoggerAwareInterface, SimpleCache\CacheInterface {
 	 * @throws SimpleCache\InvalidArgumentException
 	 *   MUST be thrown if the $key string is not a legal value.
 	 */
-	public function get($key, $default = null): mixed
+	public function get(string $key, mixed $default = null): mixed
 	{
-		try
-		{
-			return $this->_get($key, $default);
-		}
-		catch (TypeError $e)
-		{
-			throw new InvalidArgumentException($e->getMessage(), $e->getCode());
-		}
+		$this->validateKey($key);
+
+		return ($this->driver->exists($key)) ? $this->driver->get($key) : $default;
 	}
 
 	/**
@@ -91,16 +84,11 @@ class Teller implements LoggerAwareInterface, SimpleCache\CacheInterface {
 	 * @throws SimpleCache\InvalidArgumentException
 	 *   MUST be thrown if the $key string is not a legal value.
 	 */
-	public function set($key, mixed $value, $ttl = null): bool
+	public function set(string $key, mixed $value, null|int|DateInterval $ttl = null): bool
 	{
-		try
-		{
-			return $this->_set($key, $value, $ttl);
-		}
-		catch (TypeError $e)
-		{
-			throw new InvalidArgumentException($e->getMessage(), $e->getCode());
-		}
+		$this->validateKey($key);
+
+		return $this->driver->set($key, $value, $ttl);
 	}
 
 	/**
@@ -113,16 +101,11 @@ class Teller implements LoggerAwareInterface, SimpleCache\CacheInterface {
 	 * @throws SimpleCache\InvalidArgumentException
 	 *   MUST be thrown if the $key string is not a legal value.
 	 */
-	public function delete($key): bool
+	public function delete(string $key): bool
 	{
-		try
-		{
-			return $this->_delete($key);
-		}
-		catch (TypeError $e)
-		{
-			throw new InvalidArgumentException($e->getMessage(), $e->getCode());
-		}
+		$this->validateKey($key);
+
+		return $this->driver->delete($key);
 	}
 
 	/**
@@ -137,131 +120,7 @@ class Teller implements LoggerAwareInterface, SimpleCache\CacheInterface {
 	 *   MUST be thrown if $keys is neither an array nor a Traversable,
 	 *   or if any of the $keys are not a legal value.
 	 */
-	public function getMultiple($keys, mixed $default = null): iterable
-	{
-		try
-		{
-			return $this->_getMultiple($keys, $default);
-		}
-		catch (TypeError $e)
-		{
-			throw new InvalidArgumentException($e->getMessage(), $e->getCode());
-		}
-	}
-
-	/**
-	 * Persists a set of key => value pairs in the cache, with an optional TTL.
-	 *
-	 * @param iterable               $values A list of key => value pairs for a multiple-set operation.
-	 * @param null|int|DateInterval $ttl    Optional. The TTL value of this item. If no value is sent and
-	 *                                       the driver supports TTL then the library may set a default value
-	 *                                       for it or let the driver take care of that.
-	 *
-	 * @return bool True on success and false on failure.
-	 *
-	 * @throws SimpleCache\InvalidArgumentException
-	 *   MUST be thrown if $values is neither an array nor a Traversable,
-	 *   or if any of the $values are not a legal value.
-	 */
-	public function setMultiple($values, $ttl = null): bool
-	{
-		try
-		{
-			return $this->_setMultiple($values, $ttl);
-		}
-		catch (TypeError $e)
-		{
-			throw new InvalidArgumentException($e->getMessage(), $e->getCode());
-		}
-	}
-
-	/**
-	 * Deletes multiple cache items in a single operation.
-	 *
-	 * @param iterable $keys A list of string-based keys to be deleted.
-	 *
-	 * @return bool True if the items were successfully removed. False if there was an error.
-	 *
-	 * @throws SimpleCache\InvalidArgumentException
-	 *   MUST be thrown if $keys is neither an array nor a Traversable,
-	 *   or if any of the $keys are not a legal value.
-	 */
-	public function deleteMultiple($keys): bool
-	{
-		try
-		{
-			return $this->_deleteMultiple($keys);
-		}
-		catch (TypeError $e)
-		{
-			throw new InvalidArgumentException($e->getMessage(), $e->getCode());
-		}
-	}
-
-	/**
-	 * Determines whether an item is present in the cache.
-	 *
-	 * NOTE: It is recommended that has() is only to be used for cache warming type purposes
-	 * and not to be used within your live applications operations for get/set, as this method
-	 * is subject to a race condition where your has() will return true and immediately after,
-	 * another script can remove it making the state of your app out of date.
-	 *
-	 * @param string $key The cache item key.
-	 *
-	 * @return bool
-	 *
-	 * @throws SimpleCache\InvalidArgumentException
-	 *   MUST be thrown if the $key string is not a legal value.
-	 */
-	public function has($key): bool
-	{
-		try
-		{
-			return $this->_has($key);
-		}
-		catch (TypeError $e)
-		{
-			throw new InvalidArgumentException($e->getMessage(), $e->getCode());
-		}
-	}
-
-	/**
-	 * Fetches a value from the cache.
-	 * @throws Exception\InvalidArgumentException
-	 */
-	protected function _get(string $key, mixed $default = null): mixed
-	{
-		$this->validateKey($key);
-
-		return ($this->driver->exists($key)) ? $this->driver->get($key) : $default;
-	}
-
-	/**
-	 * Persists data in the cache, uniquely referenced by a key with an optional expiration TTL time.
-	 * @throws Exception\InvalidArgumentException
-	 */
-	protected function _set(string $key, mixed $value, null|int|DateInterval $ttl = null): bool
-	{
-		$this->validateKey($key);
-
-		return $this->driver->set($key, $value, $ttl);
-	}
-
-	/**
-	 * Delete an item from the cache by its unique key.
-	 * @throws Exception\InvalidArgumentException
-	 */
-	protected function _delete(string $key): bool
-	{
-		$this->validateKey($key);
-
-		return $this->driver->delete($key);
-	}
-
-	/**
-	 * Obtains multiple cache items by their unique keys.
-	 */
-	protected function _getMultiple(iterable $keys, mixed $default = null): iterable
+	public function getMultiple(iterable $keys, mixed $default = null): iterable
 	{
 		$keys = (array)$keys;
 		$this->validateKeys($keys);
@@ -286,8 +145,19 @@ class Teller implements LoggerAwareInterface, SimpleCache\CacheInterface {
 
 	/**
 	 * Persists a set of key => value pairs in the cache, with an optional TTL.
+	 *
+	 * @param iterable               $values A list of key => value pairs for a multiple-set operation.
+	 * @param null|int|DateInterval $ttl    Optional. The TTL value of this item. If no value is sent and
+	 *                                       the driver supports TTL then the library may set a default value
+	 *                                       for it or let the driver take care of that.
+	 *
+	 * @return bool True on success and false on failure.
+	 *
+	 * @throws SimpleCache\InvalidArgumentException
+	 *   MUST be thrown if $values is neither an array nor a Traversable,
+	 *   or if any of the $values are not a legal value.
 	 */
-	protected function _setMultiple(iterable $values, null|int|DateInterval $ttl = null): bool
+	public function setMultiple(iterable $values, null|int|DateInterval $ttl = null): bool
 	{
 		$this->validateKeys($values, TRUE);
 
@@ -298,8 +168,16 @@ class Teller implements LoggerAwareInterface, SimpleCache\CacheInterface {
 
 	/**
 	 * Deletes multiple cache items in a single operation.
+	 *
+	 * @param iterable $keys A list of string-based keys to be deleted.
+	 *
+	 * @return bool True if the items were successfully removed. False if there was an error.
+	 *
+	 * @throws SimpleCache\InvalidArgumentException
+	 *   MUST be thrown if $keys is neither an array nor a Traversable,
+	 *   or if any of the $keys are not a legal value.
 	 */
-	protected function _deleteMultiple(iterable $keys): bool
+	public function deleteMultiple(iterable $keys): bool
 	{
 		$this->validateKeys($keys);
 
@@ -308,9 +186,20 @@ class Teller implements LoggerAwareInterface, SimpleCache\CacheInterface {
 
 	/**
 	 * Determines whether an item is present in the cache.
-	 * @throws Exception\InvalidArgumentException
+	 *
+	 * NOTE: It is recommended that has() is only to be used for cache warming type purposes
+	 * and not to be used within your live applications operations for get/set, as this method
+	 * is subject to a race condition where your has() will return true and immediately after,
+	 * another script can remove it making the state of your app out of date.
+	 *
+	 * @param string $key The cache item key.
+	 *
+	 * @return bool
+	 *
+	 * @throws SimpleCache\InvalidArgumentException
+	 *   MUST be thrown if the $key string is not a legal value.
 	 */
-	protected function _has(string $key): bool
+	public function has(string $key): bool
 	{
 		$this->validateKey($key);
 
diff --git a/tests/TellerTest.php b/tests/TellerTest.php
index 3aec04d..f105c8f 100644
--- a/tests/TellerTest.php
+++ b/tests/TellerTest.php
@@ -15,7 +15,6 @@
  */
 namespace Aviat\Banker\Tests;
 
-use Aviat\Banker\Pool;
 use Aviat\Banker\Teller;
 use Aviat\Banker\Exception\InvalidArgumentException;
 use Monolog\Handler\SyslogHandler;
@@ -210,51 +209,6 @@ class TellerTest extends TestCase {
 		array_walk($hasKeys, fn ($key) => $this->assertTrue($this->teller->has($key)));
 	}
 
-	public function testBadKeyType(): void
-	{
-		$this->expectException(InvalidArgumentException::class);
-		$this->teller->get(546567);
-	}
-
-	public function testBadKeyTypeSet(): void
-	{
-		$this->expectException(InvalidArgumentException::class);
-		$this->teller->set(546567, 'foo');
-	}
-
-	public function testBadKeyTypeDelete(): void
-	{
-		$this->expectException(InvalidArgumentException::class);
-		$this->teller->delete(546567);
-	}
-
-	public function testBadKeyTypeHas(): void
-	{
-		$this->expectException(InvalidArgumentException::class);
-		$this->teller->has(546567);
-	}
-
-	public function testBadKeysType (): void
-	{
-		$this->expectException(InvalidArgumentException::class);
-		$keys = (object)[];
-		$this->teller->getMultiple($keys);
-	}
-
-	public function testBadKeysTypeSet (): void
-	{
-		$this->expectException(InvalidArgumentException::class);
-		$keys = (object)[];
-		$this->teller->setMultiple($keys);
-	}
-
-	public function testBadKeysTypeDelete (): void
-	{
-		$this->expectException(InvalidArgumentException::class);
-		$keys = (object)[];
-		$this->teller->deleteMultiple($keys);
-	}
-
 	/**
 	 * @dataProvider keyValidationTests
 	 * @param string $key