Adjust type declarations a little bit

[phil-davis]

1. digestParts should be a bit more flexible

2. Response.php setStatus - be more careful to set the variable to int - specially in the case when the passed-in value is ctype_digit (e.g. "200" "402" ...)

I tried phpstan level 7 and noticed these things that looked like they can and should be fixed/adjusted. Level 7 also reports a lot of stuff about PHP functions that can return "something or false" like string|false - there are quite a few places where the (remote) possibility of false is not checked. We put the return value straight into string (or whatever). In most of those cases, there is no good explanation for when false can happen - "the internet broke", "the operating system fell to pieces"... So I am not planning to analyze each one and work out some path to handle the occurrence of false. Those things could happen already with the code, they are not regressions, and if/when they happen, some unexpected code path is being taken until, presumably, something falls over. Now they are likely to fall over earlier, because PHP will complain if the code tries to assign false to some string $var - and the PHP error and traceback will point more directly the the point in the code where the problem first happened.

[codecov]

Codecov Report

Merging #194 (e95ea94) into master (1c2ac9f) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #194   +/-   ##
=========================================
  Coverage     94.78%   94.78%           
  Complexity      256      256           
=========================================
  Files            15       15           
  Lines           806      806           
=========================================
  Hits            764      764           
  Misses           42       42           

Impacted Files	Coverage Δ
lib/Auth/Digest.php	96.42% <ø> (ø)
lib/Response.php	100.00% <100.00%> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[phil-davis]

@staabm please review. I think this gets the type declarations and code OK for me to do a major version release of sabre/http

Then I can look at the other repos and keep moving forward with those.

[staabm]

Lgtm