| Field | Xcode 3.1.2 | Xcode 3.1.3 | Diff |
|---|---|---|---|
| Release type | stable | stable | same |
| Edition | - | - | same |
| Release date | 2008-11-23 | 2009-06-16 | different |
| Minimum macOS | 10.5 | 10.5.7 | different |
| Swift | unknown | unknown | same |
| iOS SDK | unknown | 3.1.3 | different |
| Build | 9M2621 | 9M2736 | different |
建议：如果你是生产环境主力开发，优先选择 stable 版本；如需验证新 SDK，再考虑 beta。