- Added Migration Build for Vue 3 with Vue 2 compatible behavior, component-level compilerOptions, runtime compiler configuration, and element casting via `is="vue:xxx"`.
- Made minor breaking changes: `$props` now always includes all declared keys and optionMergeStrategies no longer receives the component instance; deprecated `app.config.isCustomElement`, `delimiters`, and `v-is` in favor of new compilerOp...
- Fixed numerous bugs across the compatibility layer, runtime core, compiler, reactivity, suspense, keep-alive, devtools, and performance improvements.
v3.1.0 Pluto
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