Function createElementsValueAccessor

The opinionated element value accessor that applies following coercion rules.

By default:

• Single checkbox → boolean, see ElementsValueAccessorOptions.checkboxFormat;
• Multiple checkboxes → an array of value attributes of checked checkboxes, see ElementsValueAccessorOptions.checkboxFormat;
• Radio buttons → the value attribute of a radio button that is checked or null if no radio buttons are checked;
• Number input → number, or null if empty;
• Range input → number;
• Date input → the value attribute, or null if empty, see ElementsValueAccessorOptions.dateFormat;
• Time input → a time string, or null if empty, see ElementsValueAccessorOptions.timeFormat;
• Image input → string value of the value attribute;
• File input → File or null if no file selected, file inputs are read-only;
• Multi-file input → array of File;
• Others → The value attribute, or null if element doesn't support it;
• null, undefined, NaN and non-finite numbers are coerced to an empty string and written to value attribute.