Sanitize data to ASCII wherever we can

[simonvaucher]

Problem

• Someone (from Rehovot) managed in a pure stroke of unbelievable luck to add an invisible character to the unsupported_since_zapp_sdk key on the prompt.
• They invisible character was right-to-left-mark
• Versionomy gem failed while parsing the value, which looks empty but it is not

Proposed Solution

• Whenever we deal with a field that should be only ASCII characters, remove everything that's not an ASCII character.
• Example

a = "\u200F";
puts a //      => ""
a.empty? // => false

encoding_options = {
  :invalid           => :replace,  # Replace invalid byte sequences  
  :undef             => :replace,  # Replace anything not defined in ASCII  
  :replace           => '',        # Use a blank for those replacements  
  :universal_newline => true       # Always break lines with \n  
}  
a.encode(Encoding.find('ASCII'), encoding_options)
puts a //      => ""
a.empty? // => true