public boolean isGenerateBuilderFrom() {
    if (generateBuilderFrom == null) {
      generateBuilderFrom = !style().from().isEmpty()
          && !isUseStrictBuilder()
          && noAttributeInitializerIsNamedAsFrom();
    }
    return generateBuilderFrom;
  }
Means object hashcode is cached at some point. Either lazily (on first access)
or eagerly (during construction).
@see #isUseLazyhash()
@see #isUsePrehashed()
value-processor/src/org/immutables/value/processor/meta/ValueType.java