code: def coverage_bytes(self):
      format1_bytes = (
          # From https://docs.microsoft.com/en-us/typography/opentype/spec/chapter2#coverage-format-1
          # uint16	coverageFormat	Format identifier — format = 1
          # uint16	glyphCount	Number of glyphs in the glyph array
          4
          # uint16	glyphArray[glyphCount]	Array of glyph IDs — in numerical order
          + sum(len(self.ctx.all_class1[i]) for i in self.indices) * 2
      )
      ranges = sorted(
          chain.from_iterable(
              self.ctx.all_class1_data[i][0] for i in self.indices
          )
      )
      merged_range_count = 0
      last = None
      for start, end in ranges:
          if last is not None and start != last + 1:
              merged_range_count += 1
          last = end
      format2_bytes = (
          # From https://docs.microsoft.com/en-us/typography/opentype/spec/chapter2#coverage-format-2
          # uint16	coverageFormat	Format identifier — format = 2
          # uint16	rangeCount	Number of RangeRecords
          4
          # RangeRecord	rangeRecords[rangeCount]	Array of glyph ranges — ordered by startGlyphID.
          # uint16	startGlyphID	First glyph ID in the range
          # uint16	endGlyphID	Last glyph ID in the range
          # uint16	startCoverageIndex	Coverage Index of first glyph ID in range
          + merged_range_count * 6
      )
      return min(format1_bytes, format2_bytes)
  
imports: import logging
  import os
  from collections import defaultdict, namedtuple
  from functools import reduce
  from itertools import chain
  from math import log2
  from typing import DefaultDict, Dict, Iterable, List, Sequence, Tuple
  from fontTools.config import OPTIONS
  from fontTools.misc.intTools import bit_count, bit_indices
  from fontTools.ttLib import TTFont
  from fontTools.ttLib.tables import otBase, otTables
label_desc: Use image node_id 6 for calling the Cluster obj's underlying member method code with example usage: obj.coverage_bytes() and returns: min