For single base64 characters - A-Z, a-z, 0-9, + or /
Prefer using fc.constantFrom(...'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+/')
fc.constantFrom(...'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+/')
Since 0.0.1
For single base64 characters - A-Z, a-z, 0-9, + or /