Advanced Custom Fields Pro 6.4.0.1

New - Added support for persistent object caching.
Fix - Fixed PHP error in determine_locale() affecting AJAX requests.
Fix - Fixed bug affecting dynamic metabox check when selecting "default" page template.
Fix - Fixed bug where tab fields did not render correctly within a dynamic metabox.
Tweak - Removed language fallback from "zh_TW" to "zh_CN".
Dev - Refactored various core functions.
Dev - Added new hook variation functions acf_add_filter_variations() and acf_add_action_variations().
i18n - Updated Portuguese language thanks to Pedro Mendonça.
i18n - Updated German translation thanks to Ralf Koller.
i18n - Updated Swiss German translation thanks to Raphael Hüni.

Fix - Fixed bug preventing metaboxes from saving if validation fails within Gutenberg.
Fix - Fixed bug causing unload prompt to show incorrectly within Gutenberg.
Fix - Fixed JS error when selecting taxonomy terms within Gutenberg.
Fix - Fixed bug causing jQuery sortable issues within other plugins.
Tweak - Improved loading translations by adding fallback from region to country when .mo file does not exit.
Tweak - Improved punctuation throughout admin notices.
Tweak - Improved performance and accuracy when loading a user field value.
Dev - Added filter 'acf/get_locale' to customize the locale used to load translations.
Dev - Added filter 'acf/allow_unfiltered_html' to customize if current user can save unfiltered HTML.
Dev - Added new data storage functions acf_register_store() and acf_get_store().
Dev - Moved from .less to .scss and minified all css.
i18n - Updated French translation thanks to Maxime Bernard-Jacquet.
i18n - Updated Czech translation thanks to David Rychly.

* Fix - Added custom metabox location (acf_after_title) compatibility with Gutenberg.
* Fix - Added dynamic metabox check compatibility with Gutenberg.
* Fix - Fixed bug causing required date picker fields to prevent form submit.
* Fix - Fixed bug preventing multi-input values from saving correctly within media modals.
* Fix - Fixed bug where `acf_form()` redirects to an incorrect URL for sub-sites.
* Fix - Fixed bug where breaking out of a sub `have_rows()` loop could produce undesired results.
* Dev - Added filter 'acf/connect_attachment_to_post' to prevent connecting attachments to posts.
* Dev - Added JS filter 'google_map_autocomplete_args' to customize Google Maps autocomplete settings.