== JDK 25 
java 25.0.4.1  compact headers: false
  id          offset 16
  priceCents  offset 12
  stock       offset 24
  active      offset 28
  sku         offset 32
  first field starts at byte 12  (so the header is at most 12 bytes)
  a hard-coded 12-byte header would be right here

== JDK 26 
java 26.0.2.1  compact headers: false
  id          offset 16
  priceCents  offset 12
  stock       offset 24
  active      offset 28
  sku         offset 32
  first field starts at byte 12  (so the header is at most 12 bytes)
  a hard-coded 12-byte header would be right here

== JDK 27 
java 27  compact headers: true
  id          offset  8
  priceCents  offset 16
  stock       offset 20
  active      offset 24
  sku         offset 28
  first field starts at byte 8  (so the header is at most 8 bytes)
  a hard-coded 12-byte header would be WRONG here

== JDK 27 -XX:-UseCompactObjectHeaders
java 27  compact headers: false
  id          offset 16
  priceCents  offset 12
  stock       offset 24
  active      offset 28
  sku         offset 32
  first field starts at byte 12  (so the header is at most 12 bytes)
  a hard-coded 12-byte header would be right here