Optimize checking array emptiness

Author: rybakit

src/BufferUnpacker.php

@@ -48,7 +48,7 @@ public function __construct(string $buffer = '', $options = null, array $extensi
 
         $this->buffer = $buffer;
 
-        if ([] !== $extensions) {
+        if ($extensions) {
             foreach ($extensions as $extension) {
                 $this->extensions[$extension->getType()] = $extension;
             }
@@ -60,7 +60,7 @@ public function extendWith(Extension $extension, Extension ...$extensions) : sel
         $new = clone $this;
         $new->extensions[$extension->getType()] = $extension;
 
-        if ([] !== $extensions) {
+        if ($extensions) {
             foreach ($extensions as $extraExtension) {
                 $new->extensions[$extraExtension->getType()] = $extraExtension;
             }

src/Packer.php

@@ -59,7 +59,7 @@ public function __construct($options = null, array $transformers = [])
         $this->isForceArr = $options->isForceArrMode();
         $this->isForceFloat32 = $options->isForceFloat32Mode();
 
-        if ([] !== $transformers) {
+        if ($transformers) {
             $this->transformers = $transformers;
         }
     }
@@ -69,7 +69,7 @@ public function extendWith(CanPack $transformer, CanPack ...$transformers) : sel
         $new = clone $this;
         $new->transformers[] = $transformer;
 
-        if ([] !== $transformers) {
+        if ($transformers) {
             $new->transformers = \array_merge($new->transformers, $transformers);
         }
 
@@ -119,7 +119,7 @@ public function pack($value)
         if (\is_float($value)) {
             return $this->packFloat($value);
         }
-        if ([] !== $this->transformers) {
+        if ($this->transformers) {
             foreach ($this->transformers as $transformer) {
                 if (!\is_null($packed = $transformer->pack($this, $value))) {
                     return $packed;