class_docstr: A scalar with different values at different points in the designspace.
code: def add_to_variation_store(
      self, store_builder, model_cache=None, avar=None
  ):
      deltas, supports = self.get_deltas_and_supports(model_cache, avar)
      store_builder.setSupports(supports)
      index = store_builder.storeDeltas(deltas)
      return int(self.default), index
  
file_path: catboost/contrib/python/fonttools/fontTools/feaLib/variableScalar.py
imports: from fontTools.varLib.models import VariationModel, normalizeValue, piecewiseLinearMap
label_desc: Use image node_id 13 for calling the VariableScalar obj's underlying member method code with example usage: obj.add_to_variation_store(store_builder, model_cache, avar) and returns: int,  index