Floating-point numbers not accurate
Writing a floating-point / decimal number results in an inaccurate value when read:
$ dconf write /org/gnome/settings-daemon/plugins/housekeeping/free-percent-notify 0.03
$ dconf read /org/gnome/settings-daemon/plugins/housekeeping/free-percent-notify
0.029999999999999999
$ dconf write /org/gnome/settings-daemon/plugins/housekeeping/free-percent-notify 0.04
$ dconf read /org/gnome/settings-daemon/plugins/housekeeping/free-percent-notify
0.040000000000000001