old_contents: import re
  
  from skylines.lib.types import is_bytes
  
  
  whitespace_re = re.compile(br'[\x00-\x20\s]')
  non_alnum_re = re.compile(br'[^0-9a-zA-Z]')
  
  
  def normalize_whitespace(s):
      """Strip the string and replace all whitespace sequences and other
      non-printable characters with a single space."""
  
      assert is_bytes(s)
  
      return whitespace_re.sub(b' ', s.strip())
  
  
  def import_ascii(s):
      """Import a byte string, convert to a unicode string, discarding all
      non-ASCII characters."""
  
      assert is_bytes(s)
  
      s = normalize_whitespace(s)
      return s.decode('ascii', 'ignore')
  
  
  def import_alnum(s):
      """Import a byte string, convert to a unicode string,
      discarding all non-alphanumeric characters (ASCII only)."""
  
      assert is_bytes(s)
  
      s = non_alnum_re.sub(b'', s)
      return s.decode('ascii')
  
  
  def isnumeric(s):
      """Check if a string can be parsed as floating point value"""
      try:
          float(s)
      except ValueError:
          return False
  
      return True
  
new_contents: import re
  import sys
  
  from skylines.lib.types import is_bytes
  
  
  whitespace_re = re.compile(br'[\x00-\x20\s]')
  non_alnum_re = re.compile(br'[^0-9a-zA-Z]')
  
  
  def normalize_whitespace(s):
      """Strip the string and replace all whitespace sequences and other
      non-printable characters with a single space."""
  
      assert is_bytes(s)
  
      return whitespace_re.sub(b' ', s.strip())
  
  
  def import_ascii(s):
      """Import a byte string, convert to a unicode string, discarding all
      non-ASCII characters."""
  
      assert is_bytes(s)
  
      s = normalize_whitespace(s)
      return s.decode('ascii', 'ignore')
  
  
  def import_alnum(s):
      """Import a byte string, convert to a unicode string,
      discarding all non-alphanumeric characters (ASCII only)."""
  
      assert is_bytes(s)
  
      s = non_alnum_re.sub(b'', s)
      return s.decode('ascii')
  
  
  def isnumeric(s):
      """Check if a string can be parsed as floating point value"""
      try:
          float(s)
      except ValueError:
          return False
  
      return True
  
  
  def unicode_to_str(value):
      if sys.version_info[0] == 2:
          return value.encode('utf-8')
      else:
          return value
  
subject: Add `unicode_to_str()` function