module ActiveSupport::Multibyte::Unicode

def unpack_graphemes(string)

Unicode.unpack_graphemes('Café') # => [[67], [97], [102], [233]]
Unicode.unpack_graphemes('क्षि') # => [[2325, 2381], [2359], [2367]]

lists.
Unpack the string at grapheme boundaries. Returns a list of character 
def unpack_graphemes(string)
  codepoints = string.codepoints.to_a
  unpacked = []
  pos = 0
  marker = 0
  eoc = codepoints.length
  while(pos < eoc)
    pos += 1
    previous = codepoints[pos-1]
    current = codepoints[pos]
    if (
        # CR X LF
        ( previous == database.boundary[:cr] and current == database.boundary[:lf] ) or
        # L X (L|V|LV|LVT)
        ( database.boundary[:l] === previous and in_char_class?(current, [:l,:v,:lv,:lvt]) ) or
        # (LV|V) X (V|T)
        ( in_char_class?(previous, [:lv,:v]) and in_char_class?(current, [:v,:t]) ) or
        # (LVT|T) X (T)
        ( in_char_class?(previous, [:lvt,:t]) and database.boundary[:t] === current ) or
        # X Extend
        (database.boundary[:extend] === current)
      )
    else
      unpacked << codepoints[marker..pos-1]
      marker = pos
    end
  end
  unpacked
end