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jsmn would accept invalid JSON objects. This is bad because it would set ->size incorrectly: we expect to have at least size * 2 tokens (in pairs). We want to rely on ->size, but this would create an exploitable buffer overflow! Fortunately, this is fixed upstream, so we add a test and upgrade to v1.0.0. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>