Switched to IpNumber in headers

[codecov[bot]]

Codecov Report

Patch coverage: 95.16% and project coverage change: +0.01 :tada:

Comparison is base (be5a0ac) 99.29% compared to head (5a9aefb) 99.31%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #63 +/- ## ========================================== + Coverage 99.29% 99.31% +0.01% ========================================== Files 118 118 Lines 30996 31672 +676 ========================================== + Hits 30778 31455 +677 + Misses 218 217 -1 ``` | [Impacted Files](https://codecov.io/gh/JulianSchmid/etherparse/pull/63?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid) | Coverage Δ | | |---|---|---| | [etherparse/src/internet/ip\_number\_impl.rs](https://codecov.io/gh/JulianSchmid/etherparse/pull/63?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvaW50ZXJuZXQvaXBfbnVtYmVyX2ltcGwucnM=) | `100.00% <ø> (ø)` | | | [etherparse/src/link/vlan\_header.rs](https://codecov.io/gh/JulianSchmid/etherparse/pull/63?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvbGluay92bGFuX2hlYWRlci5ycw==) | `100.00% <ø> (ø)` | | | [etherparse/src/test\_packet.rs](https://codecov.io/gh/JulianSchmid/etherparse/pull/63?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvdGVzdF9wYWNrZXQucnM=) | `100.00% <ø> (ø)` | | | [etherparse/src/transport/transport\_slice.rs](https://codecov.io/gh/JulianSchmid/etherparse/pull/63?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvdHJhbnNwb3J0L3RyYW5zcG9ydF9zbGljZS5ycw==) | `100.00% <ø> (ø)` | | | [etherparse\_proptest\_generators/src/lib.rs](https://codecov.io/gh/JulianSchmid/etherparse/pull/63?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZV9wcm9wdGVzdF9nZW5lcmF0b3JzL3NyYy9saWIucnM=) | `74.73% <69.23%> (-4.84%)` | :arrow_down: | | [etherparse/src/err/double\_vlan/header\_error.rs](https://codecov.io/gh/JulianSchmid/etherparse/pull/63?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvZXJyL2RvdWJsZV92bGFuL2hlYWRlcl9lcnJvci5ycw==) | `100.00% <100.00%> (ø)` | | | [...therparse/src/err/double\_vlan/header\_read\_error.rs](https://codecov.io/gh/JulianSchmid/etherparse/pull/63?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvZXJyL2RvdWJsZV92bGFuL2hlYWRlcl9yZWFkX2Vycm9yLnJz) | `100.00% <100.00%> (ø)` | | | [...herparse/src/err/double\_vlan/header\_slice\_error.rs](https://codecov.io/gh/JulianSchmid/etherparse/pull/63?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvZXJyL2RvdWJsZV92bGFuL2hlYWRlcl9zbGljZV9lcnJvci5ycw==) | `100.00% <100.00%> (ø)` | | | [etherparse/src/err/from\_slice\_error.rs](https://codecov.io/gh/JulianSchmid/etherparse/pull/63?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvZXJyL2Zyb21fc2xpY2VfZXJyb3IucnM=) | `100.00% <100.00%> (ø)` | | | [etherparse/src/err/len\_error.rs](https://codecov.io/gh/JulianSchmid/etherparse/pull/63?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid#diff-ZXRoZXJwYXJzZS9zcmMvZXJyL2xlbl9lcnJvci5ycw==) | `100.00% <100.00%> (ø)` | | | ... and [42 more](https://codecov.io/gh/JulianSchmid/etherparse/pull/63?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid) | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Julian+Schmid)

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