docstr: Handle literals integers values. 
docstr_tok: ["Handle","literals","integers","values","."]
code: def visit_Constant(self, node):
      """Handle literals integers values."""
      if isinstance(node.value, (bool, int)):
          return self.add(node, Interval(node.value, node.value))
      return UNKNOWN_RANGE
  
imports: import gast
  from collections import defaultdict
  from functools import reduce
  from pythran.analyses import Aliases, CFG
  from pythran.intrinsic import Intrinsic
  from pythran.passmanager import ModuleAnalysis
  from pythran.interval import Interval, IntervalTuple, UNKNOWN_RANGE
  from pythran.tables import MODULES, attributes
label_desc: Use image node_id 11 for calling the RangeValuesBase obj's underlying member method code with example usage: obj.visit_Constant(node) and returns: UNKNOWN_RANGE, self