Unable to use File Parameters with Grape::Extensions::Hash::ParamBuilder

[Senchatay]

params do
  build_with Grape::Extensions::Hash::ParamBuilder
  requires :avatar, type: File
end
post '/' do
  ...
end

Returns an error #<Grape::Exceptions::ValidationErrors: avatar is invalid> because:

• This line calls deep_dup of hash values ( including tempfile)
  

  grape/lib/grape/extensions/hash.rb

  Line 14 in 0f57e01

  rack_params.deep_dup.tap do |params|

• Tempfile#deep_dup returns instance of File

• grape/lib/grape/validations/types/file.rb

  Line 25 in 0f57e01

  value.is_a?(::Hash) && value.key?(:tempfile) && value[:tempfile].is_a?(Tempfile)