Mate score should be displayed higher on the graph than TB-wins

[xu-shawn]

Example: https://tcec-chess.com/#div=sf&game=44&season=28

I believe the reason for this is in the eval clamping code in graph.js:

tcecgui/js/graph.js

Lines 150 to 169 in 11385d2

	function clamp_eval(eval_) {
	if (NON_EVALS.has(eval_))
	return undefined;
	if (!isNaN(eval_)) {
	eval_ *= 1;
	if (!Number.isFinite(eval_))
	return Clamp(eval_, -EVAL_CLAMP, EVAL_CLAMP);
	return eval_;
	}
	if (eval_ && eval_.includes('-'))
	eval_ = -EVAL_CLAMP;
	else if (eval_ != undefined)
	eval_ = EVAL_CLAMP;
	else
	eval_ = 0;
	return eval_;
	}

Here, mate scores are set to ±128, but TB wins, which are usually beyond this range (from 199-200 in SF's case), do not get clamped.