Orion, apologies for the lack of response.  We've actually been looking into this and delivery is possible, but more complicated that you might expect.

utf8proc is part of the subversion module and the utf8proc-devel subpackage would be in a corresponding subversion-devel module that is not included today.  It might be possible to ship this, but it has implications for anyone that wants to consume it.  Specifically, the CodeReady Builder (RHEL 8) or PowerTools (CentOS Stream 8) repository would need to be enabled, and you would need to explicitly enable the subversion-devel:1.10 module before the packages become avaiable.

E.g.


[root@3e778be44dc1 /]# yum module enable subversion-devel:1.10
Updating Subscription Management repositories.
Unable to read consumer identity
Subscription Manager is operating in container mode.

This system is not registered with an entitlement server. You can use subscription-manager to register.

Last metadata expiration check: 0:03:30 ago on Fri Apr 29 11:36:18 2022.
Dependencies resolved.
================================================================================
 Package           Architecture     Version             Repository         Size
================================================================================
Enabling module streams:
 subversion-devel                   1.10                                       

Transaction Summary
================================================================================

Is this ok [y/N]: y
Complete!
[root@3e778be44dc1 /]# yum install utf8proc-devel
Updating Subscription Management repositories.
Unable to read consumer identity
Subscription Manager is operating in container mode.

This system is not registered with an entitlement server. You can use subscription-manager to register.

Last metadata expiration check: 0:16:49 ago on Fri Apr 29 11:36:18 2022.
Dependencies resolved.
================================================================================
 Package     Arch   Version                              Repository        Size
================================================================================
Installing:
 utf8proc-devel
             x86_64 2.1.1-5.module+el8.3.0+6671+2675c974 subversion-devel  19 k

Transaction Summary
================================================================================
Install  1 Package

Total download size: 19 k
Installed size: 29 k
Is this ok [y/N]: 

I'm not aware of how EPEL deals with modular content, but it may require some work on the buildsystem side or for julia to be made a modular package that depends on subversion.  Before we commit to delivering this, I wanted to be sure you were aware of the implications and determine if this was even a viable solution for your goals.

I am pretty sure that EPEL flattens modules into the buildroot and so would be available for EPEL builds.  For example the kdesvn build https://koji.fedoraproject.org/koji/buildinfo?buildID=1526019 install subversion-devel just fine.

root.log shows:
DEBUG util.py:623:   subversion-devel            x86_64  1.10.2-2.module+el8.0.0+3900+919b6753 build  342 k

Thank you very much for pursuing this.

This is what it should look like for RHEL 8.7, FYI:

+ dnf repoquery -q --disable-modular-filtering utf8proc\* --qf %\{REPOID\}\ %\{name\}-%\{version\}-%\{release\}.%\{arch\}
appstream8 utf8proc-2.6.1-3.module+el8.7.0+15836+939fe0ca.x86_64
appstream8 utf8proc-2.6.1-3.module+el8.7.0+15837+7cfc8c53.x86_64
crb8 utf8proc-2.6.1-3.module+el8.7.0+15837+7cfc8c53.i686
crb8 utf8proc-devel-2.6.1-3.module+el8.7.0+15837+7cfc8c53.i686
crb8 utf8proc-devel-2.6.1-3.module+el8.7.0+15837+7cfc8c53.x86_64

Josh, thanks a lot for your help with this.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (subversion bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2022:7543