What is the purpose for number keys in getSupport

[josephrexme]

caniuse.getSupport() returns some unexpected keys in numbers like:

{ n: 3.5, a: 34, '#3': 33, d: 34, '#1': 34, y: 35 }

What do these numbers (#3, #1) mean?

[RiZKiT]

This seems to be the number of the footnotes, see https://caniuse.com/#feat=es6-module and compare it with the API results:

{ and_chr: { y: 62 },
  and_ff: { n: 57, d: 57, '#2': 57 },
  and_qq: { n: 1.2 },
  and_uc: { n: 11.4 },
  android: { n: 62 },
  baidu: { n: 7.12 },
  bb: { n: 10 },
  chrome: { n: 60, d: 60, '#1': 60, y: 61 },
  edge: { n: 15, d: 15, '#1': 15, y: 16 },
  firefox: { n: 60, d: 60, '#2': 60 },
  ie: { n: 11 },
  ie_mob: { n: 11 },
  ios_saf: { n: 10, y: 10.3 },
  op_mini: {},
  op_mob: { n: 37 },
  opera: { n: 51, d: 51, '#1': 51 },
  safari: { n: 10, y: 10.1 },
  samsung: { n: 6.2 } 
}