Parsing date with the lowercase month returning invalid date (format: MMM D, YYYY)

Hi, could someone help please, I have a question regarding parsing format with lowercase months names (`en` locale) and getting an invalid date.
We're looking for opportunity to allow user use different input formats and also want to allow use date with the lowercase months:
| Input String | isValid() method value |
| ------------- | ------------- |
| | **false** - invalid date |
| | true - valid date |

Is there any way to get valid date parsing with the first letter of the month in lowercase?

Appreciate your help!

Start by reproducing the reported `en` locale parsing case with the `MMM D, YYYY` format and compare title-case and lowercase month inputs. Trace the date parsing entry point and existing locale behavior; done means lowercase month names parse as valid dates without breaking the existing format.

Written by the indexing model from the issue text.