{"type":"rich","version":1.0,"title":"mutable references","width":1987,"html":"<a href=\"https://asciinema.org/a/118051\" target=\"_blank\"><img alt=\"mutable references\" src=\"https://asciinema.org/a/118051.png\" width=\"1987\"></a>","height":1048,"author_name":"baboum","author_url":"https://asciinema.org/~baboum","provider_url":"https://asciinema.org/","thumbnail_url":"https://asciinema.org/a/118051.png","thumbnail_width":1987,"thumbnail_height":1048,"provider_name":"asciinema"}