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BSON encoder and decoder for Gleam

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bison src bison custom.gleam
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src/bison/custom.gleam 

pub const min_binary_custom_code = 0x80



pub const max_binary_custom_code = 0xff



pub opaque type Custom {

  Custom(code: BitArray, value: BitArray)

}



pub fn to_bit_array_with_code(custom: Custom) {

  let assert Custom(code: <<code>>, value: value) = custom

  #(code, value)

}



pub fn from_bit_array_with_code(code: Int, value: BitArray) {

  case code <= max_binary_custom_code && code >= min_binary_custom_code {

    True -> Ok(Custom(code: <<code>>, value: value))

    False -> Error(Nil)

  }

}