Fix cargo build -p geo_filters --features serde

[jorendorff]

This previously failed with

❯ cargo build -p geo_filters --features serde
   Compiling geo_filters v0.1.0 (/Users/jorendorff/src/rust-gems/crates/geo_filters)
error[E0433]: failed to resolve: could not find `Deserialize` in `serde`
   --> crates/geo_filters/src/diff_count/sim_hash.rs:28:45
    |
 28 | #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
    |                                             ^^^^^^^^^^^ could not find `Deserialize` in `serde`
    |
note: found an item that was configured out
   --> /Users/jorendorff/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/serde-1.0.214/src/lib.rs:343:24
    |
341 | #[cfg(feature = "serde_derive")]
    |       ------------------------ the item is gated behind the `serde_derive` feature
342 | #[cfg_attr(docsrs, doc(cfg(feature = "derive")))]
343 | pub use serde_derive::{Deserialize, Serialize};
    |                        ^^^^^^^^^^^

...and two other similar errors.

It'd be nice to make a release once this merges, so I bumped the version number.

[Copilot]

Pull request overview

Fixes the geo_filters crate failing to compile when enabling the serde feature by ensuring Serde’s derive macros are available, and adds a Makefile check to prevent similar feature-gating regressions.

Changes:

• Enable Serde’s derive feature for the optional serde dependency to make serde::Serialize/serde::Deserialize available.
• Bump geo_filters crate version to 0.1.1.
• Add cargo check invocations in make test to validate building geo_filters with no features and with individual features enabled.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
crates/geo_filters/Cargo.toml	Enables serde derives under the serde feature and bumps the crate version.
Makefile	Adds per-feature cargo check to catch feature-specific build failures early.

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[Copilot]

The comment says each feature is compiled “in isolation”, but the per-feature cargo check commands don’t pass --no-default-features. That’s equivalent today because default = [], but if default features are added later these checks will no longer validate isolation. Consider adding --no-default-features to the test-support/serde/evaluation checks as well (or updating the comment).

Suggested change

	cargo check -p geo_filters --features test-support
	cargo check -p geo_filters --features serde
	cargo check -p geo_filters --features evaluation
	cargo check -p geo_filters --no-default-features --features test-support
	cargo check -p geo_filters --no-default-features --features serde
	cargo check -p geo_filters --no-default-features --features evaluation

[itsibitzi]

Thanks for this!