error_output.txt

In lib/mongo/src/bson.cr:228:61

 228 | unless LibBSON.bson_append_array_begin(handle, key, key.bytesize, child_handle)
                                                               ^-------
Error: undefined method 'bytesize' for Array(MessagePack::Type) (compile-time type is (Array(MessagePack::Type) | Bool | Float64 | Hash(MessagePack::Type, MessagePack::Type) | Int16 | Int32 | Int64 | Int8 | String | UInt16 | UInt32 | UInt64 | UInt8 | Nil))

msgpack_to_bson.cr

require "msgpack"
require "mongo/bson"

query = {
  "age" => {
    "$gt" => 30
  }
}

#de Native Hash to MessagePack encoded string...
puts msgpack = String.new(query.to_msgpack)

#de Encided string to Hash(String, MessagePack::Type)
query_reborn = Hash(String, MessagePack::Type).from_msgpack(msgpack)

#de The goal:
puts bson = query.to_bson #de Works
puts bson = query_reborn.to_bson #de Throws type-oriented error