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Also see:
- https://openwrt.org/faq/difference_between_a_release_and_a_trunk_build
- https://openwrt.org/docs/guide-quick-start/developmentinstallation#what_is_a_development_snapshot_firmware
No. The opposite is true. Numbered versions [release candidates] are branched off at a certain point in the Master Branch (i.e. SNAPSHOT).
See: https://git.openwrt.org/?p=openwrt/openwrt.git;a=heads
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