| Field | Xcode 4.2.1 | Xcode 4.2 | Diff |
|---|---|---|---|
| Release type | stable | stable | same |
| Edition | - | - | same |
| Release date | 2011-11-17 | 2011-10-12 | different |
| Minimum macOS | 10.7 | 10.7 | same |
| Swift | unknown | unknown | same |
| iOS SDK | unknown | unknown | same |
| Build | 4D502 | 4D199 | different |
Recommendation: keep production teams on stable releases unless you need to validate new SDK capabilities.