Version names starting with underscore and numbers lead to NameError

[langalex]

Given an uploader:

class MyUploader < CarrierWave::Uploader::Base
  version :_800x600 do
    process resize_to_fill: [800, 600]
  end
end

leads to this error:

NameError:
  wrong constant name 800x600VersionUploader

# [..]/carrierwave-3.0.5/lib/carrierwave/uploader/versions.rb:23:in `const_set'
# [..]/carrierwave-3.0.5/lib/carrierwave/uploader/versions.rb:23:in `build'
# [..]/carrierwave-3.0.5/lib/carrierwave/uploader/versions.rb:176:in `block in versions'
# [..]/carrierwave-3.0.5/lib/carrierwave/uploader/versions.rb:175:in `each'
# [..]/carrierwave-3.0.5/lib/carrierwave/uploader/versions.rb:175:in `versions'
# [..]/carrierwave-3.0.5/lib/carrierwave/uploader/versions.rb:301:in `active_versions'
# [..]/carrierwave-3.0.5/lib/carrierwave/uploader/versions.rb:309:in `derived_versions'
# [..]/carrierwave-3.0.5/lib/carrierwave/uploader/versions.rb:329:in `cache_versions!'
# [..]/carrierwave-3.0.5/lib/carrierwave/uploader/callbacks.rb:16:in `block in with_callbacks'
# [..]/carrierwave-3.0.5/lib/carrierwave/uploader/callbacks.rb:16:in `each'
# [..]/carrierwave-3.0.5/lib/carrierwave/uploader/callbacks.rb:16:in `with_callbacks'
# [..]/carrierwave-3.0.5/lib/carrierwave/uploader/cache.rb:146:in `cache!'
# [..]/carrierwave-3.0.5/lib/carrierwave/uploader/versions.rb:234:in `cache!'
# [..]/carrierwave-3.0.5/lib/carrierwave/uploader/store.rb:80:in `store!'

A possible solution could be to prefix the generated class name.