Prototype pollution mitigation to stage 1, per 2023.01.30 TC39

Author: ljharb

stage-1-proposals.md

@@ -96,6 +96,7 @@ Proposals follow [this process document](https://tc39.es/process-document/).
 | [Object pick/omit][pick-omit]                                                                | Hemanth HM<br />Aleen                                  | Hemanth HM                                            | <sub>[July&nbsp;2022][pick-omit-notes]</sub>                      |
 | [Extractors][extractors]                                                                     | Ron Buckton                                            | Ron Buckton                                           | <sub>[September&nbsp;2022][extractors-notes]</sub>                |
 | [Mass Proxy Revocation][mass-proxy-revocation]                                               | Alex Vincent                                           | Mark S. Miller, Jack Works                            | <sub>[November&nbsp;2022][mass-proxy-revocation-notes]</sub>      |
+| [Prototype pollution mitigation][proto-pollution]                                            | Santiago Díaz<br />Jun Kokatsu                         | Shu-Yu Guo                                            | <sub>January&nbsp;2023</sub>                                      |
 
 See also the [active proposals](README.md), [stage 0 proposals](stage-0-proposals.md), [finished proposals](finished-proposals.md), and [inactive proposals](inactive-proposals.md) documents.
 
@@ -278,3 +279,4 @@ See also the [active proposals](README.md), [stage 0 proposals](stage-0-proposal
 [extractors-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-09/sep-15.md#extractor-objects
 [mass-proxy-revocation]: https://github.com/ajvincent/proposal-mass-proxy-revocation
 [mass-proxy-revocation-notes]: https://github.com/tc39/notes/blob/HEAD/meetings/2022-11/dec-01.md#mass-proxy-revocation-for-stage-1
+[proto-pollution]: https://github.com/syg/proposal-symbol-proto