The water problem, and why 227 is not wrong
King Arthur lists one cup of water at 227 grams. A US cup is 236.6 millilitres and water is within a fraction of a percent of one gram per millilitre, so a cup of water weighs about 236 grams, not 227. The 227 figure is the baking shorthand that treats eight fluid ounces as eight ounces of weight. It is a convention, not a density.
Both numbers are defensible and the gap is 4.13%. In a bread dough with 500 grams of flour, one cup of water is either 45.4 percent hydration or 47.2 percent. Almost two points is something you feel in your hands. Use 236 where the ratio is tight, use the chart figure where the recipe has slack, and never mix the two inside one recipe.