$ java -Xmx3g -XX:-UseCompactObjectHeaders MillionStrings      (JDK 27)
java.version = 27
strings                      : 1,000,000 (average 42.50 chars)
coder == 0 (LATIN1) in set A : 1,000,000
coder == 1 (UTF16)  in set B : 1,000,000
# WARNING: Unable to attach Serviceability Agent. sun.jvm.hotspot.runtime.VM.isCompressedKlassPointersEnabled()
A: lower-case ASCII only     : 89,844,680 bytes  (89.8 MB, 89.8 bytes per string)
B: same + one euro sign      : 133,839,824 bytes  (133.8 MB, 133.8 bytes per string)
B / A                        : 1.490