Exception when trying to name box θ a

[rigdern]

Repro steps

I reproed this with Boxer 3.4.19 2024-06-24 on macOS.

1. Create a data box. Name it θ a (note the space between θ and a)
2. Hit return to accept the name

Unexpected result: A Common Lisp exception is thrown:

Lisp Error:#\θ (of type CHARACTER) is not of type BASE-CHAR. 

Screenshot:

(θ seems to work fine when the box name doesn't contain any spaces.)

[sgithens]

Fixed in 8811531 will be in 3.4.21

[sgithens]

Verified in v.3.4.21 and closing.