code: def _getScalar(self, regionIdx):
      scalar = self._scalars.get(regionIdx)
      if scalar is None:
          support = self._regions[regionIdx].get_support(self.fvar_axes)
          scalar = supportScalar(self.location, support)
          self._scalars[regionIdx] = scalar
      return scalar
  
imports: from fontTools.misc.roundTools import noRound, otRound
  from fontTools.misc.intTools import bit_count
  from fontTools.ttLib.tables import otTables
  from fontTools.varLib.models import supportScalar
  from fontTools.varLib.builder import buildVarRegionList, buildVarStore, buildVarRegion, buildVarData
  from functools import partial
  from collections import defaultdict
  from heapq import heappush, heappop
label_desc: Use image node_id 4 for calling the VarStoreInstancer obj's underlying member method code with example usage: obj._getScalar(regionIdx) and returns: scalar