We are currently using the 2.x version and wanted to update to the new 3.x version. In the process, however, our unit tests failed.
The original statement no longer works:

Tilde operator: ~1.0.0 can be written as >=1.0.0 <1.1.0 and read as »every version within minor version 1.1. The behavior of tilde operator depends on whether a patch level version is provided or not. If no patch level is provided, tilde operator behaves like the caret operator: ~1.0 is identical to ^1.0.

When parsing a version number, "0" is now always set instead of "null" for the patch default value, so that the "getPatch()->isAny()" method returns true every time. It then assumes, for example, "~7.0.0" even if you pass "~7.0" and a comparison with 7.1 then fails.