Forms

CoordinatesType is a position as two number fields, latitude and longitude, to and from Coordinates; it reads decimals in the request's locale, to seven places.

$builder->add('position', CoordinatesType::class, ['required' => false]);

Both fields empty is no position, null. One field without the other, or a value off the Earth, makes the field invalid with its invalid_message, This value is not a valid position.

A null needs a property that takes one. The Doctrine embeddable holds a position always: bound to it, keep the field 'required' => true. An optional position is stored as two nullable columns instead, as the Doctrine document shows.