Added more checks (#2917)

phpstan-baseline.neon

@@ -114,3 +114,8 @@ parameters:
 			message: "#^Result of && is always false\\.$#"
 			count: 1
 			path: src/Cookie/SetCookie.php
+
+		-
+			message: "#^Result of && is always false\\.$#"
+			count: 1
+			path: src/HandlerStack.php

src/Handler/CurlMultiHandler.php

@@ -205,6 +205,10 @@ private function addRequest(array $entry): void
      */
     private function cancel($id): bool
     {
+        if (!is_int($id)) {
+            trigger_deprecation('guzzlehttp/guzzle', '7.4', 'Not passing an integer to %s::%s() is deprecated and will cause an error in 8.0.', __CLASS__, __FUNCTION__);
+        }
+
         // Cannot cancel if it has been processed.
         if (!isset($this->handles[$id])) {
             return false;

src/HandlerStack.php

@@ -180,6 +180,10 @@ public function after(string $findName, callable $middleware, string $withName =
      */
     public function remove($remove): void
     {
+        if (!is_string($remove) && !is_callable($remove)) {
+            trigger_deprecation('guzzlehttp/guzzle', '7.4', 'Not passing a callable or string to %s::%s() is deprecated and will cause an error in 8.0.', __CLASS__, __FUNCTION__);
+        }
+
         $this->cached = null;
         $idx = \is_callable($remove) ? 0 : 1;
         $this->stack = \array_values(\array_filter(
@@ -251,7 +255,7 @@ private function splice(string $findName, string $withName, callable $middleware
     /**
      * Provides a debug string for a given callable.
      *
-     * @param callable $fn Function to write as a string.
+     * @param callable|string $fn Function to write as a string.
      */
     private function debugCallable($fn): string
     {