916eca6a1e
The old default values (start/end frame = 1) could have been an actually desired setting (for example when exporting a non-animated model). To make this worse, this was only interpreted as "start/end of the scene" by the export operator when running interactively, but not when run from Python. By choosing INT_MIN as default it's highly unlikely that the interval [start, end) was intended as actual export range.