Jsonaf_kernel.Serializerserialize_hum ~spaces t serializes t in a “human readable” form with newlines separating elements of objects and arrays and an additional indentation of spaces spaces for their contents. A typical choice is ~spaces:2.
Passing ~spaces:0 gives the exact same output as serialize.
val run_hum : spaces:int -> t -> stringrun_hum ~spaces, t should produce very similar output to JSON.stringify(t,null,spaces) in JavaScript.