ruby layer: typeprof fails

[costa]

At the time of writing: the latest MacOS, the latest brew, the latest ruby, the latest emacs, all the latest config and packages yield:

---undefined method 'map' for nil (NoMethodError)
---
---      folders = @params[:workspaceFolders].map do |folder|
---                                          ^^^^
/opt/homebrew/Cellar/ruby/3.4.6/lib/ruby/gems/3.4.0/gems/typeprof-0.30.1/lib/typeprof/lsp/messages.rb:58:in 'TypeProf::LSP::Message::Initialize#run': undefined method 'map' for nil (NoMethodError)

      folders = @params[:workspaceFolders].map do |folder|
                                          ^^^^
	from /opt/homebrew/Cellar/ruby/3.4.6/lib/ruby/gems/3.4.0/gems/typeprof-0.30.1/lib/typeprof/lsp/server.rb:113:in 'block in TypeProf::LSP::Server#run'
	from /opt/homebrew/Cellar/ruby/3.4.6/lib/ruby/gems/3.4.0/gems/typeprof-0.30.1/lib/typeprof/lsp/server.rb:181:in 'TypeProf::LSP::Reader#read'
	from /opt/homebrew/Cellar/ruby/3.4.6/lib/ruby/gems/3.4.0/gems/typeprof-0.30.1/lib/typeprof/lsp/server.rb:106:in 'TypeProf::LSP::Server#run'
	from /opt/homebrew/Cellar/ruby/3.4.6/lib/ruby/gems/3.4.0/gems/typeprof-0.30.1/lib/typeprof/lsp/server.rb:18:in 'TypeProf::LSP::Server.start_stdio'
	from /opt/homebrew/Cellar/ruby/3.4.6/lib/ruby/gems/3.4.0/gems/typeprof-0.30.1/lib/typeprof/cli/cli.rb:115:in 'TypeProf::CLI::CLI#run_lsp'
	from /opt/homebrew/Cellar/ruby/3.4.6/lib/ruby/gems/3.4.0/gems/typeprof-0.30.1/lib/typeprof/cli/cli.rb:107:in 'TypeProf::CLI::CLI#run'
	from /opt/homebrew/Cellar/ruby/3.4.6/lib/ruby/gems/3.4.0/gems/typeprof-0.30.1/bin/typeprof:5:in '<top (required)>'
	from /opt/homebrew/opt/ruby/bin/typeprof:25:in 'Kernel#load'
	from /opt/homebrew/opt/ruby/bin/typeprof:25:in '<main>'

Process typeprof-ls stderr finished

(started happening after an MBP upgrade)