Thirteen methods on Photo, make() through gpsAltitude(), each named after
its PhotoExif field and typed by it. Each calls exif() with the same opts
and returns that one field, or undefined when the file lacks it. A test
checks, on the JPEG fixture and on test/exif.heic, that every field
exif() returns has a method giving the same value. README and TODO.md
list them.
Model: opus-5-5