make version props typed

[remicollet]

This also make them really readonly

        Property [ public readonly string $libraryVersion ]
        Property [ public readonly int $protocolVersion ]
        Property [ public readonly string $serverVersion ]

BUT it breaks because of call to "write" in the "read" function, which is commented out here
Can you please explain why this (don't see anything similar in php-src) ?

[codecov]

Codecov Report

Merging #51 (2bd0c68) into master (fbbe06a) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
+ Coverage   76.82%   76.84%   +0.01%     
==========================================
  Files          17       17              
  Lines        3612     3615       +3     
==========================================
+ Hits         2775     2778       +3     
  Misses        837      837              

Impacted Files	Coverage Δ
src/php_pq_object.c	94.28% <ø> (-0.16%)	⬇️
src/php_pqconn.c	67.97% <100.00%> (+0.20%)	⬆️

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[m6w6]

Can you please explain why this (don't see anything similar in php-src) ?

Well, duh... not really, except, using git blame: a3b5ed1

[remicollet]

In old v1.1.1, I don't see any "write" in the "read" method
https://github.com/m6w6/ext-pq/blob/v1.1.1/src/php_pq_object.c#L121

Looks like it was added in big commit cb69b62