Options retrieval issues in get_field_objects()

Looks like get_field_objects() generates non optimal sql query, when as $post_id is provided option name with '_' character or ending with a digit.

For example, this call:
get_fields('option1');

generates query:

SELECT option_name, option_value
FROM wp_options
WHERE option_name LIKE 'option1_%'
OR option_name LIKE '_option1_%';

and could match some records, which belongs to 'option11', 'option12' and so on.

If I understand correctly, query should have every '_' char in params escaped here
https://github.com/AdvancedCustomFields/acf/blob/c8e181c848009aa9f6a3919ee19981fb2774f634/includes/api/api-template.php#L242-L246

to create query like this:

SELECT option_name, option_value
FROM wp_options
WHERE option_name LIKE 'option1\_%'
OR option_name LIKE '\_option1\_%';

For some cases I have several times more rows retrieved from database than it's necessary.

Start in includes/api/api-template.php at lines 242-246 and reproduce the get_fields('option1') case described in the issue. Check the generated SQL against option names such as option11 and option12; done means underscores in the parameter are treated literally so unrelated option rows are not matched.