blobs with null are truncated on saving

[romand]

require 'data_mapper'

DataMapper.setup(:default, 'sqlite::memory:')

class TestModel
  include DataMapper::Resource

  property :id, Serial, key: true
  property :data, Binary
end

DataMapper.finalize
DataMapper.auto_upgrade!

data = "adsf\u0000asdf"
TestModel.new(data: data).save
puts TestModel.last.data.size
# % ruby test.rb
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