Cargo Features

[dependencies]
gasp-swap = { version = "0.1.2", default-features = false, features = ["std", "web"] }
default = std

The std feature is set by default whenever gasp-swap is added without default-features = false somewhere in the dependency tree.

std default

Enables std of bounded-collections, sp-arithmetic ^23.0.0, and sp-std

web = wasm-bindgen

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.

wasm-bindgen web?