Compare block state property values with equals, not reference identity

[pirateben820]

What

BuilderProcess.sameBlockstate compares each property's value with !=:

Map<Property<?>, Comparable<?>> map1 = first.getValues();
Map<Property<?>, Comparable<?>> map2 = second.getValues();
for (Property<?> prop : map1.keySet()) {
    if (map1.get(prop) != map2.get(prop)

The values are boxed Comparables, so this is reference identity. It is fine for EnumProperty and
BooleanProperty, whose values are singletons. For an IntegerProperty it happens to work today because every
vanilla integer property stays inside the -128..127 range the JVM's Integer cache interns — I checked: the largest,
age, tops out at 25. Nothing in the comparison guarantees that, and identity is not what is meant here; equality is.

Objects.equals to match the three other comparisons in this file. Plain equals would also be correct, since both
states share one StateDefinition and the lookups cannot return null.

This branch is only reached when buildIgnoreDirection or buildIgnoreProperties is set (both default off);
otherwise the early first.equals(second) return is taken.

Verification

Compiles on this branch (./gradlew compileJava, Gradle 8.7, Temurin JDK 21.0.12.1). GitHub's own runs are waiting on first-contributor approval. Not run in game - it is a one-line change to a comparison.

Authorship

This patch and this description were written by an AI assistant (Claude, via Claude Code) working under my direction,
while I was debugging my own mod, which drives Baritone from a language model. I am submitting it and I answer for it.
If the project would rather not take AI-written changes, say so and I will close it.

🤖 Generated with Claude Code

[pirateben820]

Retargeted to 1.21.4 as requested on #5123. The change had to be re-expressed rather than rebased: on 1.21.4 the comparison is map1.get(prop) != map2.get(prop) over getValues(), so it is Objects.equals there. The description now describes that code; the earlier one described the 26.2 shape. Compiles on 1.21.4 (Gradle 8.7, JDK 21).