unction Ca(){return!!this.isValid()&&(this._isUTC&&0===this._offset)}M.updateOffset=function(){};var Ia=/^(-|\+)?(?:(\d*)[. ])?(\d+):(\d+)(?::(\d+)(\.\d*)?)?$/,Ua=/^(-|\+)?P(?:([-+]?[0-9,.]*)Y)?(?:([-+]?[0-9,.]*)M)?(?:([-+]?[0-9,.]*)W)?(?:([-+]?[0-9,.]*)D)?(?:T(?:([-+]?[0-9,.]*)H)?(?:([-+]?[0-9,.]*)M)?(?:([-+]?[0-9,.]*)S)?)?$/;function Ga(e,a){var t,s,n,r=e,d=null;return Aa(e)?r={ms:e._milliseconds,d:e._days,M:e._months}:m(e)||!isNaN(+e)?(r={},a?r[a]=+e:r.milliseconds=+e):(d=Ia.exec(e))?(t="-"==...

## Other notable changes
### API Machinery

- kube-apiserver: the `--runtime-config` flag now supports an `api/beta=false` value which disables all built-in REST API versions matching `v[0-9]+beta[0-9]+`. ([#84304](https://github.com/kubernetes/kubernetes/pull/84304), [@liggitt](https://github.com/liggitt))

- github.com/heketi/heketi: [v10.2.0+incompatible → v10.3.0+incompatible](https://github.com/heketi/heketi/compare/v10.2.0...v10.3.0)
- github.com/mattn/go-runewidth: [v0.0.9 → v0.0.7](https://github.com/mattn/go-runewidth/compare/v0.0.9...v0.0.7)
- github.com/olekukonko/tablewriter: [v0.0.5 → v0.0.4](https://github.com/olekukonko/tablewriter/compare/v0.0.5...v0.0.4)

- github.com/kr/pty: [v1.1.1](https://github.com/kr/pty/tree/v1.1.1)
- github.com/magiconair/properties: [v1.8.1](https://github.com/magiconair/properties/tree/v1.8.1)
- github.com/mattn/go-colorable: [v0.0.9](https://github.com/mattn/go-colorable/tree/v0.0.9)
- github.com/mattn/go-isatty: [v0.0.3](https://github.com/mattn/go-isatty/tree/v0.0.3)
- github.com/miekg/dns: [v1.0.14](https://github.com/miekg/dns/tree/v1.0.14)

- github.com/marten-seemann/qtls: [v0.2.3](https://github.com/marten-seemann/qtls/tree/v0.2.3)
- github.com/mattn/go-colorable: [v0.0.9](https://github.com/mattn/go-colorable/tree/v0.0.9)
- github.com/mattn/go-isatty: [v0.0.3](https://github.com/mattn/go-isatty/tree/v0.0.3)
- github.com/mholt/certmagic: [6a42ef9](https://github.com/mholt/certmagic/tree/6a42ef9)

- github.com/magiconair/properties: [v1.8.5](https://github.com/magiconair/properties/tree/v1.8.5)
- github.com/mattn/go-colorable: [v0.0.9](https://github.com/mattn/go-colorable/tree/v0.0.9)
- github.com/mattn/go-isatty: [v0.0.3](https://github.com/mattn/go-isatty/tree/v0.0.3)
- github.com/miekg/dns: [v1.0.14](https://github.com/miekg/dns/tree/v1.0.14)

- github.com/hashicorp/serf: [v0.8.2](https://github.com/hashicorp/serf/tree/v0.8.2)
- github.com/jtolds/gls: [v4.20.0+incompatible](https://github.com/jtolds/gls/tree/v4.20.0)
- github.com/mattn/go-colorable: [v0.0.9](https://github.com/mattn/go-colorable/tree/v0.0.9)
- github.com/mattn/go-isatty: [v0.0.3](https://github.com/mattn/go-isatty/tree/v0.0.3)
- github.com/miekg/dns: [v1.0.14](https://github.com/miekg/dns/tree/v1.0.14)

- Kubelet: changed `MemoryThrottlingFactor` default value to `0.9` and formulas to calculate `memory.high` ([#115371](https://github.com/kubernetes/kubernetes/pull/115371), [@pacoxu](https://github.com/pacoxu))

- github.com/jtolds/gls: [v4.20.0+incompatible](https://github.com/jtolds/gls/tree/v4.20.0)
- github.com/mattn/go-colorable: [v0.0.9](https://github.com/mattn/go-colorable/tree/v0.0.9)
- github.com/mattn/go-isatty: [v0.0.3](https://github.com/mattn/go-isatty/tree/v0.0.3)
- github.com/miekg/dns: [v1.0.14](https://github.com/miekg/dns/tree/v1.0.14)

<p>
The underscore character <code>_</code> (U+005F) is considered a lowercase letter.
</p>
<pre class="ebnf">
letter        = unicode_letter | "_" .
decimal_digit = "0" … "9" .
binary_digit  = "0" | "1" .
octal_digit   = "0" … "7" .
hex_digit     = "0" … "9" | "A" … "F" | "a" … "f" .
</pre>

<h2 id="Lexical_elements">Lexical elements</h2>

<h3 id="Comments">Comments</h3>

<p>