GitLab

Double objects:
 0.0  !=  0.0  (Double a@1554874502 b@1846274136)
 1.0  !=  1.0  (Double a@1639705018 b@1627674070)
Infinity  !=  Infinity (Double a@1360875712 b@1625635731)
 NaN  !=  NaN  (Double a@1580066828 b@491044090)

Integer objects:
   0  ==  0    (Integer a@644117698 b@644117698)
 127  ==  127  (Integer a@1872034366 b@1872034366)
 127  ==  127  (Integer a@1872034366 b@1872034366)
 127  ==  127  (Integer a@1872034366 b@1872034366)
 128  !=  128  (Integer a@1581781576 b@1725154839)
   1  !=  1    (Integer a@1670675563 b@723074861)
   2  ==  2    (Integer a@895328852 b@895328852)

String objects:
   a  ==  a    (String a@1304836502 b@1304836502)
   a  !=  a    (String a@225534817 b@1304836502)
   a  !=  a    (String a@1878246837 b@929338653)
   a  ==  a    (String a@1304836502 b@1304836502)
   a  ==  a    (String a@1304836502 b@1304836502)
java.lang.Object@4b1210ee  !=  java.lang.Object@4d7e1886 (Object a@1259475182 b@1300109446)

String concatenation (+):
  ab  ==  ab   (String a@1020371697 b@1020371697)
  ab  !=  ab   (String a@1020371697 b@789451787)
  ab  ==  ab   (String a@1020371697 b@1020371697)
  ab  !=  ab   (String a@1020371697 b@1950409828)

also – double and float are not exact:
1.00 == 1.00 ? false