Mac Spotlight Search doesn't follow this rule and it's sooooo annoying. I have Firefox and Firefox Developer Edition both installed and the top search suggestion seems to randomly switch back and forth between the two depending on how many letters of "firefox" I type.
Trying to switch to 1Password is somehow even more irritating. Typing "1p" reasonably suggests 1Password. If I continue typing "1pa", however, I'm given the hilariously unrelated knowledge that 1 Pascal is equal to 0.0075 Torrs. Pressing return then takes me a Google search (in Safari, which isn't even my default browser) for "1pa" which gives me yet another pressure unit conversion, 1 Pa = 1e-5 bar.