check

    fn check(ctx: *const FuzzContext, n_allocs: usize) !void {
        @disableInstrumentation();
        for (ctx.allocs[0..n_allocs]) |allocation| {
            const len: usize = switch (allocation.common.len) {
                .free => continue,
                _ => |len| @backingInt(len),
            };
            const control = allocation.control_ptr[0..len];
            const sample = allocation.sample_ptr[0..len];
            try std.testing.expectEqualSlices(u8, control, sample);
        }
    }