Calendar info in `Date`/`DateTime` is lost

[nobu]

$ ruby -rdate -rpsych \
  -e 'di = Date.new(1000, 1, 1, Date::ITALY)' \
  -e 'dg = Date.new(1000, 1, 1, Date::GREGORIAN)' \
  -e 'puts Psych.dump([di, dg]), di == dg'
---
- 1000-01-01
- 1000-01-01
false

As shown by the last false di and dg are different dates, but cannot distinguish in the YAML dumped by Psych.

[bquorning]

Did this regress in v5.2.4?

❯ ruby -rdate \
  -e 'gem "psych", "5.2.3"; require "psych"' \
  -e 'di = Date.new(1000, 1, 1, Date::ITALY)' \
  -e 'dg = Date.new(1000, 1, 1, Date::GREGORIAN)' \
  -e 'puts Psych.dump([di, dg]), di == dg'
---
- 1000-01-06
- 1000-01-01

❯ ruby -rdate \
  -e 'gem "psych", "5.2.4"; require "psych"' \
  -e 'di = Date.new(1000, 1, 1, Date::ITALY)' \
  -e 'dg = Date.new(1000, 1, 1, Date::GREGORIAN)' \
  -e 'puts Psych.dump([di, dg]), di == dg'
---
- 1000-01-01
- 1000-01-01