* add get_num_nodes()

* doc improvements

* doc and test improvements

* doc fixes

* update copyright year

Co-authored-by: Andreas Klöckner <inform@tiker.net>

* Cache StringifyMapper

* flake8

* make it a separate mapper

Kaushik Kulkarni authored 3 years ago and Andreas Klöckner committed 3 years ago

Co-authored-by: Andreas Kloeckner <inform@tiker.net>

* add new kwargs to ifft too

* Fix typo