SizePol

import vson.json;

static struct SizeI {
	int x;
	int y;
}
SizeI sizeI = SizeI(1,2);
Json serializedI = serializeWithPolicy!(JsonSerializer, SizePol)(sizeI);
assert(serializedI.get!string == "1x2");

static struct SizeF {
	float x;
	float y;
}
SizeF sizeF = SizeF(0.1f,0.2f);
Json serializedF = serializeWithPolicy!(JsonSerializer, SizePol)(sizeF);
assert(serializedF.get!string == "0.1x0.2");