I'm a convert to spaces after someone pointed out that it's easier to make your code 'pretty'.

    // This doesn't look very nice
    thing = { some_key_1: some_var_1,
    [->][->][->]some_key_2: some_var_2,
    [->][->][->]some_key_3: some_var_3 }
    
    // Neither does this.
    thing = { some_key_1: some_var_1,
    [->][->]some_key_2: some_var_2,
    [->][->]some_key_3: some_var_3 }
    
    // Feels good, man.
    thing = { some_key_1: some_var_1,
              some_key_2: some_var_2,
              some_key_3: some_var_3 }
    
    // I want to beat you with an oar.
    thing = { some_key_1: some_var_1,
    [->][->]  some_key_2: some_var_2,
    [->][->]  some_key_3: some_var_3 }