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+prompt_toolkit uses pygments styles for syntax highlighting. By default, the
+colors specified in the style are approximated using a standard 256-color
+palette. prompt_toolkit also supports 24bit, a.k.a. "true", a.k.a. 16-million
+color escape sequences which enable compatible terminals to display the exact
+colors specified instead of an approximation. This true_color option exposes
+that capability in prompt_toolkit to the IPython shell.
+
+Here is a good source for the current state of true color support in various
+terminal emulators and software projects: https://gist.github.com/XVilka/8346728