ycb_sympy_pr22456

what a new run launched now would send

Argument invariance of codegen.ast String
Currently, the `codegen.ast` `String` class does not support argument invariance like:
`expr.func(*expr.args) == expr`, but instead uses the invariance `expr.func(**expr.kwargs()) == expr`.
The former should hold for any `Basic` subclass, which `String` is.

Work only inside this repository checkout. Make the code change the task
describes, keeping the diff focused — no drive-by refactors.

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