Why paths defined in webrestrictions.xml can't contain numbers?

Summary

In the Magento enterprise module Webrestriction, at etc/webrestrictions.xsd can be found the pattern:

<xs:restriction base="xs:string">
  <xs:pattern value="[a-zA-Z_]+" />
</xs:restriction>

Is there any reason for not accepting numbers?

I see that in the past similar flexibility was added on other modules, for example the ImportExport.
See https://github.com/magento/magento2/issues/4470

Can we have a similar change applied on Webrestriction module (Enterprise)?

Examples

In my extension I defined actions path as follows:

<action path="pitbulk_saml2_account_forcelogin" type="generic"/>

so I receive the error:

etc/webrestrictions.xml Element 'action', attribute 'path': [facet 'pattern'] The value 'pitbulk_saml2_account_forcelogin' is not accepted by the pattern '[a-zA-Z_]+'.

Proposed solution

Change the pattern:

<xs:restriction base="xs:string">
  <xs:pattern value="[a-zA-Z0-9_]+" />
</xs:restriction>

Release note

No response

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.