pub const MIN_READER_VERSION: u32 = 1;Expand description
The lowest reader version that can read what this build writes.
Section 9 of the format document is the whole policy: a change a version one
reader can skip past does not move this, and a change it would misread does.
It is not the same number as FORMAT_VERSION and conflating them is how a
reader ends up refusing a file it could have read.