Use magic-fallback-mode-alist instead of magic-mode-alist #60
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Currently json-mode uses
magic-mode-alistfor mode detection. This list is prioritized overauto-mode-alistso it causes problems when a file starts with a either{or[but isn't actually JSON.Emacs provides
magic-fallback-mode-alistwhich is essentially the same thing asmagic-mode-alist, but is checked afterauto-mode-alist. In a fresh install of emacs, it's used for detecting things like html/xml, so this seems like it would be a better fit for json-mode.See Choosing Modes in the emacs manual for more details.