TYPO3 Core

The YAML configuration for the Number form element in file
EXT:form/Configuration/Yaml/FormElements/Number.yaml
has an error.

TYPO3:
  CMS:
    Form:
      prototypes:
        standard:
          formElementsDefinition:
            Number:
              formEditor:
                editors:
                  # ---
                  700:
                    identifier: step
                    templateName: Inspector-TextEditor
                    label: formEditor.elements.TextMixin.editor.step.label
                    configurationOptions:
                      viewPorts:
                        # ---
                      numbersOfColumnsToUse:
                    propertyPath: properties.fluidAdditionalAttributes.step
                    propertyValidators:
                      10: Integer
                  # ---

So the 700 editor is like a mixture between the step configuration from the Date form element configuration and
the gridColumnViewPortConfiguration from all the other form elements

The consequence of this misconfiguration is that the Grid viewport configuration is not shown

I suggest that the configuration should be like

TYPO3:
  CMS:
    Form:
      prototypes:
        standard:
          formElementsDefinition:
            Number:
              formEditor:
                editors:
                  # ---
                  550:
                    identifier: step
                    templateName: Inspector-TextEditor
                    label: formEditor.elements.TextMixin.editor.step.label
                    propertyPath: properties.fluidAdditionalAttributes.step
                    propertyValidators:
                      10: Integer
                  700:
                    identifier: gridColumnViewPortConfiguration
                    templateName: Inspector-GridColumnViewPortConfigurationEditor
                    label: formEditor.elements.FormElement.editor.gridColumnViewPortConfiguration.label
                    configurationOptions:
                      viewPorts:
                        10:
                          viewPortIdentifier: xs
                          label: formEditor.elements.FormElement.editor.gridColumnViewPortConfiguration.xs.label
                        20:
                          viewPortIdentifier: sm
                          label: formEditor.elements.FormElement.editor.gridColumnViewPortConfiguration.sm.label
                        30:
                          viewPortIdentifier: md
                          label: formEditor.elements.FormElement.editor.gridColumnViewPortConfiguration.md.label
                        40:
                          viewPortIdentifier: lg
                          label: formEditor.elements.FormElement.editor.gridColumnViewPortConfiguration.lg.label
                        50:
                          viewPortIdentifier: xl
                          label: formEditor.elements.FormElement.editor.gridColumnViewPortConfiguration.xl.label
                        60:
                          viewPortIdentifier: xxl
                          label: formEditor.elements.FormElement.editor.gridColumnViewPortConfiguration.xxl.label
                      numbersOfColumnsToUse:
                        label: formEditor.elements.FormElement.editor.gridColumnViewPortConfiguration.numbersOfColumnsToUse.label
                        propertyPath: 'properties.gridColumnClassAutoConfiguration.viewPorts.{@viewPortIdentifier}.numbersOfColumnsToUse'
                        fieldExplanationText: formEditor.elements.FormElement.editor.gridColumnViewPortConfiguration.numbersOfColumnsToUse.fieldExplanationText
                  # ---