* Fix a memory leak caused by `lru_cache` on methods.
* Fix a regression issue that copying an array results in extra `None` items.
* Fix a regression of `array.add_line` that it incorrectly adds a comma to
non-value lines.
* Fix adding float to an integer value.
* Keep the end-of-array style when adding items to or removing items from an array.
* Fix a bug of redundant table header shown when removing children from a
super table.
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-tomlkit?expand=0&rev=19