Aserde integration is gated behind the"serde" feature flag. It is slower, producesslightly larger output, and (by extension) is not compatible with the nativebitcode::{Encode, Decode}.

bitcode isn't self-describing, so it doesn't supportserde features that rely on self-description:

• enum's with#[serde(untagged)] or#[serde(tag = ...)].
• Fields with#[serde(skip_serializing_if = ...)],#[serde(default)], etc.
• Types likeserde_json::Value, which internally serialize different types (numbers, arrays, etc.) without a normal enum discriminant.

• Theserde version omits theflowinfo andscope_id fields ofstd::net::SocketAddrV6, but thederive versionkeeps them.
• Theserde version supports recursive types, but thederive version (as of version0.6) does not.