CHICAGO — Rounding is a concept taught fairly early in grade school, so color Mason Miller a bit confused.

104.5?

That might as well be 105 mph, right?

“I (round up) too; I don’t know what’s up with that,” Miller said with a laugh. “They shortchanged me a little bit.”

To be clear, no one is shortchanging Miller.

The 104.5 mph four-seamer to strike out Carson Kelly looking for the second out of the seventh inning was not only the fastest of his career, it was the fastest postseason pitch by any player since the start of pitch-tracking era in 2008.

Only a handful of pitchers have actually hit 105 mph without rounding — Aroldis Chapman, Ben Joyce and Jordan Hicks — with Chapman topping out at 105.8 mph on Sept. 24, 2010 as a rookie while facing Padres outfielder Tony Gwynn Jr. at Petco

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