reverted:
--- b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/NumericItemBase.php
+++ a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/NumericItemBase.php
@@ -61,19 +61,6 @@
       '#description' => t("Define a string that should be suffixed to the value, like ' m', ' kb/s'. Leave blank for none. Separate singular and plural values with a pipe ('pound|pounds')."),
     );
 
-    // Set the step for floating point and decimal numbers.
-    switch ($this->getFieldDefinition()->getType()) {
-      case 'decimal':
-        $element['min']['#step'] = pow(0.1, $settings['scale']);
-        $element['max']['#step'] = pow(0.1, $settings['scale']);
-        break;
-
-      case 'float':
-        $element['min']['#step'] = 'any';
-        $element['max']['#step'] = 'any';
-        break;
-    }
-
     return $element;
   }
 
only in patch2:
unchanged:
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/DecimalItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/DecimalItem.php
@@ -94,6 +94,19 @@ public function storageSettingsForm(array &$form, FormStateInterface $form_state
   /**
    * {@inheritdoc}
    */
+  public function fieldSettingsForm(array $form, FormStateInterface $form_state) {
+    $element = parent::fieldSettingsForm($form, $form_state);
+    $settings = $this->getSettings();
+
+    $element['min']['#step'] = pow(0.1, $settings['scale']);
+    $element['max']['#step'] = pow(0.1, $settings['scale']);
+
+    return $element;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function preSave() {
     $this->value = round($this->value, $this->getSetting('scale'));
   }
only in patch2:
unchanged:
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/FloatItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/FloatItem.php
@@ -9,6 +9,7 @@
 
 use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\Core\Field\FieldStorageDefinitionInterface;
+use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\TypedData\DataDefinition;
 
 /**
@@ -51,6 +52,18 @@ public static function schema(FieldStorageDefinitionInterface $field_definition)
   /**
    * {@inheritdoc}
    */
+  public function fieldSettingsForm(array $form, FormStateInterface $form_state) {
+    $element = parent::fieldSettingsForm($form, $form_state);
+
+    $element['min']['#step'] = 'any';
+    $element['max']['#step'] = 'any';
+
+    return $element;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public static function generateSampleValue(FieldDefinitionInterface $field_definition) {
     $settings = $field_definition->getSettings();
     $precision = rand(10, 32);