fields property
The fields that should be updated.
At least one field must be specified. The root 'slideProperties' is
implied and should not be specified. A single "*" can be used as
short-hand for listing every field. For example to update whether a slide
is skipped, set fields to "isSkipped". To reset a property to its
default value, include its field name in the field mask but leave the
field itself unset.
Implementation
core.String? fields;