My go-to way of quickly parsing arguments is as follows:

#!/bin/bash                                                                  
                                                                             
quiet="true"                                                                 
files=()                                                                     
                                                                             
for arg in "${@}"; do                                                        
    case "${arg}" in                                                         
        "-v" | "--verbose")                                                  
            quiet="false"                                                    
            ;;                                                               
        *)
            files+=(                                                         
                "${arg}"                                                     
            )                                                                   
            ;;                                                               
    esac                                                                     
done                                                                         

Beautysh (v6.1.0) incorrectly reports this as indent/outdent mismatch and instead indents it like so:

#!/bin/bash                                                                  
                                                                             
quiet="true"                                                                 
files=()                                                                     
                                                                             
for arg in "${@}"; do                                                        
    case "${arg}" in                                                         
        "-v" | "--verbose")                                                  
            quiet="false"                                                    
            ;;                                                               
        *)                                                                   
            files+=(                                                         
                "${arg}"                                                     
            )                                                                
                ;;                                                           
        esac                                                                 
    done

The deciding factor seems to be the multi-line parenthesis in assigning files. If I assign it all on one line, like this:

            files+=("${arg}")                                                

then beautysh is satisfied with the indentation (i.e. doesn’t change it or report a mismatch).