4.0.0 Params Empty/Missing? about sinatra

[dentarg]

I can't reproduce

curl --data "foo=bar" localhost:5050/login yields this output

$ bundle e puma -p 5050
Puma starting in single mode...
* Puma version: 6.4.2 (ruby 3.2.2-p53) ("The Eagle of Durango")
*  Min threads: 0
*  Max threads: 5
*  Environment: development
*          PID: 60360
* Listening on http://0.0.0.0:5050
Use Ctrl-C to stop
POST /login
params
{"foo"=>"bar"}
127.0.0.1 - - [23/Jan/2024:11:10:50 +0100] "POST /login HTTP/1.1" 200 - 0.0008

---

$ cat -n Gemfile Gemfile.lock app.rb config.ru
     1	# frozen_string_literal: true
     2
     3	source "https://rubygems.org"
     4
     5	# gem "rails"
     6
     7	gem "sinatra", "~> 4.0"
     8
     9	gem "puma", "~> 6.4"
     1	GEM
     2	  remote: https://rubygems.org/
     3	  specs:
     4	    base64 (0.2.0)
     5	    mustermann (3.0.0)
     6	      ruby2_keywords (~> 0.0.1)
     7	    nio4r (2.7.0)
     8	    puma (6.4.2)
     9	      nio4r (~> 2.0)
    10	    rack (3.0.8)
    11	    rack-protection (4.0.0)
    12	      base64 (>= 0.1.0)
    13	      rack (>= 3.0.0, < 4)
    14	    rack-session (2.0.0)
    15	      rack (>= 3.0.0)
    16	    ruby2_keywords (0.0.5)
    17	    sinatra (4.0.0)
    18	      mustermann (~> 3.0)
    19	      rack (>= 3.0.0, < 4)
    20	      rack-protection (= 4.0.0)
    21	      rack-session (>= 2.0.0, < 3)
    22	      tilt (~> 2.0)
    23	    tilt (2.3.0)
    24
    25	PLATFORMS
    26	  x86_64-darwin-21
    27
    28	DEPENDENCIES
    29	  puma (~> 6.4)
    30	  sinatra (~> 4.0)
    31
    32	BUNDLED WITH
    33	   2.4.22
     1	require "sinatra"
     2	post "/login" do
     3	  puts 'POST /login'      # ==> POST /login
     4	  puts 'params' unless params.empty?
     5	  puts 'no params' if params.empty?      # ==> no params
     6	  puts params      # ==> {}
     7	end
     1	require_relative "app"
     2	run Sinatra::Application

[daBee]

Ya all kinds of things have gone wrong so I'm taking a new approach. I'll close.