How hard would it be to make a liner for the common cases if this? I'd expect most format strings to be literals (no concatenation or anything), passed to the f

How hard would it be to make a liner for the common cases if this? I'd expect most format strings to be literals (no concatenation or anything), passed to the formatting API in a way that can be easily statically determined. Any use of YYYY without we should be assumed to be a mistake. It can also be detected at runtime. Debug builds could warn it crash. Future APIs just shouldn't have YYYY mean this. Use another letter.