only lower case parameter names are allowed (upper case will crash in PM_sim$new()

[masyamada]

Describe the bug
In with_indexed_errors() the parameter names are lower case, even if the parameter names in the pop description are upper case

Expected behavior
parameter names are constant from declaration in the model throughout R computation

Screenshots
2 Error in map():
3 ℹ In index: 1.
4 Caused by error in if (!outside_check(draw, lower_j, upper_j)) ...:
5 ! missing value where TRUE/FALSE needed
6
7 Hide Traceback
8 ▆
9 1. ├─PM_sim$new(...) at lapk/saem/one_comp_test:38:1
10 2. │ └─Pmetrics (local) initialize(...)
11 3. │ └─private$SIMrun(...)
12 4. │ └─private$getSimPrior(...)
13 5. │ └─Pmetrics:::generate_multimodal_samples(...)
14 6. │ └─purrr::map(...)
15 7. │ └─purrr:::map_("list", .x, .f, ..., .progress = .progress)
16 8. │ ├─purrr:::with_indexed_errors(...)
17 9. │ │ └─base::withCallingHandlers(...)
18 10. │ ├─purrr:::call_with_cleanup(...)
19 11. │ └─Pmetrics (local) .f(.x[[i]], ...)
20 12. └─base::.handleSimpleError(...)
21 13. └─purrr (local) h(simpleError(msg, call))
22 14. └─cli::cli_abort(...)
23 15. └─rlang::abort(...)
~

Version information
metrics 3.2.4
osx

Additional context
no.

[mhovd]

The simulator, pharmsol, will always convert parameters to lowercase. We should document this better, and improve the safeguards. This error seems to be purely in how Pmetrics checks for parameters, so should be relatively easy to fix.