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Decision 129: Metalama 2027.0 moves into 2.4.0, so a consumer with only SDK 11 builds #280
Description
The maintainer's requirement (2026-10-31): 2.4.0 compiles for every .NET 11 consumer, also one with only the .NET 11 SDK installed. Metalama 2026.1 cannot meet it: a web project with the Generators package fails with LAMA0625 on SDK 11 alone (#275, KB-060, spikes/Sdk11Rc3Metalama).
A new decision record replaces decision 120's Metalama timing: Metalama 2027.0 moves into 2.4.0 for both targets, and 2.4.0 is tagged only on a stable 2027.0. The roadmap, #173 and the two epics follow it.
Done when decision 129 and its index row are in, decision 120's status names it, the roadmap says it, #173 and #272 are under the 2.4.0 epic, the 2.5.0 epic's goal is rewritten, the SDK-11-only CI lane has its issue, and #275 and #170 say what changed.
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[-]Decision 131: Metalama 2027.0 moves into 2.4.0, so a consumer with only SDK 11 builds[/-][+]Decision 129: Metalama 2027.0 moves into 2.4.0, so a consumer with only SDK 11 builds[/+]