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num_enum

v0.7.6 Growing

Procedural macros to make inter-operation between primitives and enums easier.

BSD-3-Clause OR MIT OR Apache-2.0 Edition 2021 MSRV 1.70.0
Rust patterns #ffi#conversion#enum#derive#safe

Quick Verdict

  • โœ“Actively maintained (updated 12d ago)
  • !Pre-1.0: API may have breaking changes
  • โœ“Massive adoption (11.5K crates depend on it)
  • โœ“Permissive license (BSD-3-Clause OR MIT OR Apache-2.0)

Security

Checking security advisories...
Downloads
179.9M
Dependents
11.5K
Releases
33
Size
22KB

Deep Insights

๐Ÿ“Š
Steady growth

13.6M downloads in the last 30 days (453.0K/day), up 16% from the previous period.

๐Ÿ›๏ธ
Foundational crate

11.5K crates depend on num_enum โ€” it's part of the Rust ecosystem's core infrastructure. Removing it from your dependency tree would be extremely difficult.

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Single maintainer risk

num_enum has only 1 owner despite 11.5K dependents. This is a bus-factor concern โ€” consider the implications for long-term support.

๐Ÿ”ฌ
Pre-1.0 for over a year

Despite being 7+ years old, num_enum hasn't reached 1.0 yet. Expect potential API changes between versions.

๐Ÿ“
Compact crate

At 21KB, num_enum is lightweight. Small crate size correlates with focused, well-scoped functionality.

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Used by top crates

Notable dependents include ndk, rdkafka-sys, zookeeper-client, android-activity, spl-token-2022. When high-quality crates choose num_enum, it's a strong quality signal.

Health Breakdown

Maintenance 18/25

Recency, release consistency, active ratio

Quality 15/25

Yanked ratio, deps, size, maturity, features

Community 14/20

Reverse deps, ownership, ecosystem

Popularity 8/15

Downloads, momentum, growth trend

Documentation 12/15

Docs, repo, license, metadata

Download Trend

Daily downloads ยท last 90 days
380K/day avg+47%
0200K400K600K12/291/162/32/213/113/28

Top Dependents

Version Adoption

v0.5.11
34%
v0.7.3
25%
v0.6.1
17%
v0.7.4
15%
v0.7.5
11%

Release Timeline

33 releases1 yankedsince 2018
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2018
2
2019
9
2020
3
2021
5
2022
1
2023
8
2024
2
2025
2
2026
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Yanked

Feature Flags

default =["std"]

std*external_doccomplex-expressions

README

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Maintainers

Dependencies
6
direct dependencies
Dependents
11.5K
crates depend on num_enum

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