Cargo Features

but-what-about has no features set by default.

[dependencies]
but-what-about = { version = "0.1.0", features = ["grapheme"] }
grapheme = unicode-segmentation

Affects permutable::GraphemeString

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

unicode-segmentation grapheme?