**Feature summary** Add a frame method to scribunto to create child frames and process arguments with a limited subset of the preprocessing that `frame:preprocess` would do.
The subset of `frame:preprocess`: the parsing that is applied on arg input to module invocations.
An example of this problem:
```
{{#invoke:test|dump_args|== {{!}} wikitext ==
* to [[wikipedia:HTML|HTML]] conversion
* should ''not'' happen now}}
```
If a Lua table of args are split by a parser module and passed through `frame:preprocess`, that becomes:
```
"==| '\"`UNIQ--h-0--QINU`\"' wikitext ==\
* to [[wikipedia:HTML|HTML]] conversion\
* should ''not'' happen now"
```
If you don't use `frame:preprocess` none of the argument wikitext is expanded by `frame:newChild` and that's also wrong to me.
**Use case(s)** (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):
# Matching behaviour between templates and modules for raw argument tables in parent or grandparent frames.
# Unit testing of Scribunto modules
**Benefits** (why should this be implemented?):
Would make it much easier to test modules and follow the exact output produced from the Scribunto module's input.