fix: use external_size instead of encoding json

[chasers]

Calculating JSON Size

Mix.install([
  {:jason, "~> 1.4"}
])

JSON

json = """
PRIVATE
"""

decoded = Jason.decode!(json)

hiding_output = nil

nil

IO.iodata_length

decoded
|> Jason.encode!()
|> inspect(
  binaries: :as_strings,
  charlists: :as_lists,
  limit: :infinity,
  printable_limit: :infinity
)
|> IO.iodata_length()

3362

:erlang.byte_size

decoded |> :erlang.term_to_binary() |> :erlang.byte_size()

3408

json |> :erlang.byte_size()

4125

:erlang.external_size

decoded |> :erlang.external_size()

3408