code: def anchorsValidator(value, identifiers=None):
      """
      Version 3+.
      """
      if not isinstance(value, list):
          return False
      if identifiers is None:
          identifiers = set()
      for anchor in value:
          if not anchorValidator(anchor):
              return False
          identifier = anchor.get("identifier")
          if identifier is not None:
              if identifier in identifiers:
                  return False
              identifiers.add(identifier)
      return True
  
imports: import calendar
  from io import open
  import fs.base
  import fs.osfs
  from collections.abc import Mapping
  from fontTools.ufoLib.utils import numberTypes
label_desc: Use image node_id 36 for calling a global function with example usage: anchorsValidator(value, identifiers) and returns: True, False, False, False