function setConstraint(sKey, vValue) {
			if (vValue !== undefined) {
				mConstraints ??= {};
				mConstraints[sKey] = vValue;
			}
		}
Returns the type constraints for the given property.

@param {object} oProperty
  The property
@param {string} sMetaPath
  The OData metadata model path corresponding to the given property
@returns {object|undefined}
  The type constraints for the property or <code>undefined</code> if the property's type is
  not supported

@private