@Nonnull
	public ObservableInteger getDefaultDownsampleTargetVersion() {
		return defaultDownsampleTargetVersion;
	}
Not enforced internally by {@link JavacCompiler}.
Callers should check this value and ensure to call {@link JavacArgumentsBuilder#withDownsampleTarget(int)}.

@return Negative to disable down sampling, otherwise target version to downsample compiled code to
<i>(In class file version format)</i>
recaf-core/src/main/java/software/coley/recaf/services/compile/JavacCompilerConfig.java