l3keys: inherit does not seem to inherit defaults

[callegar]

Using .inherit:n it looks like only the variable setting actions are inherited for the inherited keys while the default values (i.e. the default:n) are not (I wonder if the initialization values, that is initial:n is passed).

For instance if you have

\keys_define:nn {test-1}
  {
    foo .bool_set:N = \g_scstuff_roman_constants_bool,
    foo .initial:n = true,
    foo .default:n = true,

and

\keys_define:nn { }
  {  
    test .inherit:n = test-1
  }

then \ProcessKeysPackageOptions{test} errors out if the package options include foo. The error message says that the key foo accepts boolean values only.

[eg9]

The initial value is preserved, because it was already set.

\documentclass{article}
\usepackage{expl3}

\ExplSyntaxOn
\keys_define:nn {test-1}
  {
    foo .bool_gset:N = \g_scstuff_roman_constants_bool,
    foo .initial:n = true,
    foo .default:n = true,
  }

\keys_define:nn { }
  {
    test .inherit:n = test-1
  }

\keys_set:nn { test } {foo} % raises error

\bool_show:N \g_scstuff_roman_constants_bool

\stop

produces

! LaTeX3 Error: Key 'foo' accepts boolean values only.

For immediate help type H <return>.
 ...                                              
                                                  
l.17 \keys_set:nn { test } {foo}
                                 % raises error
? 
> \g_scstuff_roman_constants_bool=true.
<recently read> }
                 
l.19 \bool_show:N \g_scstuff_roman_constants_bool