Change getSeenFraction to return float

Vanilla uses float here, so it may change behaviorly slightly
by using more precision.

patches/server/0029-Actually-optimise-explosions.patch

@@ -34,7 +34,7 @@ The results indicate that this logic is 5 times faster than Vanilla
 and 2.3 times faster than Lithium.
 
 diff --git a/src/main/java/net/minecraft/world/level/Explosion.java b/src/main/java/net/minecraft/world/level/Explosion.java
-index e8c4815960ab144298d4352f393b9670e7004e62..744b9e4666aade8d84f84807900d4ee31afef7b6 100644
+index e8c4815960ab144298d4352f393b9670e7004e62..53f708a58a2b86fb81602b028a357990a632b49b 100644
 --- a/src/main/java/net/minecraft/world/level/Explosion.java
 +++ b/src/main/java/net/minecraft/world/level/Explosion.java
 @@ -96,6 +96,271 @@ public class Explosion {
@@ -257,7 +257,7 @@ index e8c4815960ab144298d4352f393b9670e7004e62..744b9e4666aade8d84f84807900d4ee3
 +        }
 +    }
 +
-+    private double getSeenFraction(final Vec3 source, final Entity target,
++    private float getSeenFraction(final Vec3 source, final Entity target,
 +                                   final ExplosionBlockCache[] blockCache,
 +                                   final BlockPos.MutableBlockPos blockPos) {
 +        final AABB boundingBox = target.getBoundingBox();
@@ -270,7 +270,7 @@ index e8c4815960ab144298d4352f393b9670e7004e62..744b9e4666aade8d84f84807900d4ee3
 +        final double incZ = 1.0 / (diffZ * 2.0 + 1.0);
 +
 +        if (incX < 0.0 || incY < 0.0 || incZ < 0.0) {
-+            return 0.0;
++            return 0.0f;
 +        }
 +
 +        final double offX = (1.0 - Math.floor(1.0 / incX) * incX) * 0.5 + boundingBox.minX;
@@ -302,7 +302,7 @@ index e8c4815960ab144298d4352f393b9670e7004e62..744b9e4666aade8d84f84807900d4ee3
 +            }
 +        }
 +
-+        return (double)missedRays / (double)totalRays;
++        return (float)missedRays / (float)totalRays;
 +    }
 +    // Paper end - optimise collisions
 +