bisectable6

query

say -Inf .. 'Z'

result

¦«2015.12,2016.01.1,2016.02,2016.03,2016.04,2016.05,2016.06,2016.07.1,
  2016.08.1,2016.09,2016.10,2016.11,2016.12,2017.01,2017.02,2017.03,
  2017.04.3,2017.05,e538cbc^»:
Cannot convert string to number: base-10 number must begin with valid digits or '.' in '⏏Z' (indicated by ⏏)
  in block <unit> at /tmp/o2Aqksbn3l line 1

Actually thrown at:
  in block <unit> at /tmp/o2Aqksbn3l line 1

 «exit code = 1»
¦«e538cbc,2017.06,2017.07,2017.08,2017.09,2017.10,2017.11,2017.12,2018.01,
  2018.02.1,2018.03,2018.04.1,2018.05,2018.06,2018.08,2018.09,2018.10,
  2018.11,2018.12,2019.03.1,2019.07.1,2019.11,2020.01,2020.02.1,2020.05.1,
  2020.06,2020.07,2020.08.2,2020.09,2020.10,2020.11,2020.12,2021.02.1,
  2021.03,2021.04,2021.05,2021.06,2021.07,2021.08,2021.09,2021.10,2021.12,
  2022.02,2022.03,2022.04,2022.06,2022.07,2022.12,2023.02,2023.04,
  HEAD(4b69dd5)»:
Cannot convert string to number: base-10 number must begin with valid digits or '.' in '⏏Z' (indicated by ⏏)
  in block <unit> at /tmp/o2Aqksbn3l line 1

 «exit code = 1»