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Comment by nmjohn | Hacker News Reader

Some examples of how it works:

    ^1.2.3 := >=1.2.3 <2.0.0
    ^0.2.3 := >=0.2.3 <0.3.0
    ^0.0.3 := >=0.0.3 <0.0.4

Why dont they just use that version notation ? (>=0.0.2,<0.1.0) will be much simpler

For every single dependency in most projects that honor semver? ^ is just an extremely convenient shorthand.