Do not round values of parameters, we can now use the full double precision

This fixes issue #681

Author: jbtronics

src/Form/Type/ExponentialNumberType.php

@@ -27,6 +27,7 @@
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\Extension\Core\Type\NumberType;
 use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\OptionsResolver\OptionsResolver;
 
 /**
  * Similar to the NumberType, but formats small values in scienfitic notation instead of rounding it to 0, like NumberType
@@ -38,6 +39,14 @@ public function getParent(): string
         return NumberType::class;
     }
 
+    public function configureOptions(OptionsResolver $resolver)
+    {
+        $resolver->setDefaults([
+            //We want to allow the full precision of the number, so disable rounding
+            'scale' => null,
+        ]);
+    }
+
     public function buildForm(FormBuilderInterface $builder, array $options)
     {
         $builder->resetViewTransformers();

src/Form/Type/Helper/ExponentialNumberTransformer.php

@@ -33,11 +33,12 @@
 class ExponentialNumberTransformer extends NumberToLocalizedStringTransformer
 {
     public function __construct(
-        protected ?int $scale = null,
+        private ?int $scale = null,
         ?bool $grouping = false,
         ?int $roundingMode = \NumberFormatter::ROUND_HALFUP,
         protected ?string $locale = null
     ) {
+        //Set scale to null, to disable rounding of values
         parent::__construct($scale, $grouping, $roundingMode, $locale);
     }
 
@@ -85,12 +86,28 @@ protected function getScientificNumberFormatter(): \NumberFormatter
         $formatter = new \NumberFormatter($this->locale ?? \Locale::getDefault(), \NumberFormatter::SCIENTIFIC);
 
         if (null !== $this->scale) {
-            $formatter->setAttribute(\NumberFormatter::FRACTION_DIGITS, $this->scale);
+            $formatter->setAttribute(\NumberFormatter::MAX_FRACTION_DIGITS, $this->scale);
             $formatter->setAttribute(\NumberFormatter::ROUNDING_MODE, $this->roundingMode);
         }
 
         $formatter->setAttribute(\NumberFormatter::GROUPING_USED, (int) $this->grouping);
 
+        return $formatter;
+    }
+
+    protected function getNumberFormatter(): \NumberFormatter
+    {
+        $formatter = parent::getNumberFormatter();
+
+        //Unset the fraction digits, as we don't want to round the number
+        $formatter->setAttribute(\NumberFormatter::FRACTION_DIGITS, 0);
+        if (null !== $this->scale) {
+            $formatter->setAttribute(\NumberFormatter::MAX_FRACTION_DIGITS, $this->scale);
+        } else {
+            $formatter->setAttribute(\NumberFormatter::MAX_FRACTION_DIGITS, 100);
+        }
+
+
         return $formatter;
     }
 }