renamed exception to be more consistent with original PHP one

src/exceptions.php

 <?php declare(strict_types=1);
 namespace Grifart\AssertFunction;
 
-use Throwable;
-
-
-
-final class AssertFunctionError extends \AssertionError {
+final class FunctionAssertionError extends \AssertionError {
 
 	const PATH_DEPTH = 2;
 
@@ -53,5 +49,3 @@ final class AssertFunctionError extends \AssertionError {
 		return implode('/', $pathParts); // normalized shortened readable path
 	}
 };
-
-abstract class RuntimeException extends \RuntimeException {};

src/functions.php

@@ -5,7 +5,7 @@
 
 // todo: use only assert( ... ) instead of exceptions; to be compatible without configuration with PHP env
 // todo: [performance] separate code itself into autoloaded class
-// todo: better assertion messages + throw AssertFunctionError + catch in fn + pass it to assert -> compatible with PHP assert config
+// todo: better assertion messages + throw FunctionAssertionError + catch in fn + pass it to assert -> compatible with PHP assert config
 // todo: covariance and contra-variance
 
 namespace Grifart\AssertFunction;
@@ -29,7 +29,7 @@ function assertSignature(callable $function, array $parameters, ?string $expecte
 	$numberOfParameters = $reflection->getNumberOfParameters();
 	assert(
 		$numberOfParameters === count($parameters),
-		AssertFunctionError::wrongNumberOrArguments($reflection, count($parameters), $numberOfParameters)
+		FunctionAssertionError::wrongNumberOrArguments($reflection, count($parameters), $numberOfParameters)
 	);
 	if ($numberOfParameters !== count($parameters)) {
 		return;
@@ -53,7 +53,7 @@ function assertSignature(callable $function, array $parameters, ?string $expecte
 	if($expectedReturnType !== NULL) {
 		assert(
 			$reflection->hasReturnType(),
-			AssertFunctionError::missingReturnType($reflection, $expectedReturnType)
+			FunctionAssertionError::missingReturnType($reflection, $expectedReturnType)
 		);
 
 		if ($reflection->hasReturnType()) {