Fix up in array strictness for string value comparison.

[dereuromark]

Now that we are using more string types, the type going into those is usually quite clear.
This makes it a bit faster but more importantly avoids false positive comparison in some cases where casting would create wrong results.

Follow #1951

[codecov-commenter]

Codecov Report

Base: 88.63% // Head: 88.63% // No change to project coverage 👍

Coverage data is based on head (76346ae) compared to base (5531e13).
Patch coverage: 92.85% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1953   +/-   ##
=========================================
  Coverage     88.63%   88.63%           
  Complexity     8019     8019           
=========================================
  Files           243      243           
  Lines         24549    24549           
=========================================
  Hits          21759    21759           
  Misses         2790     2790           

Flag	Coverage Δ
5-max	88.63% <92.85%> (ø)
7.4	88.63% <92.85%> (ø)
agnostic	67.39% <67.85%> (ø)
mysql	69.13% <64.28%> (ø)
pgsql	69.17% <67.85%> (ø)
sqlite	67.15% <57.14%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/Propel/Generator/Model/Table.php	90.56% <50.00%> (ø)
src/Propel/Runtime/Map/ColumnMap.php	77.16% <75.00%> (ø)
...ltipleColumns/AggregateMultipleColumnsBehavior.php	96.18% <100.00%> (ø)
src/Propel/Generator/Builder/Om/QueryBuilder.php	91.32% <100.00%> (ø)
src/Propel/Generator/Model/Column.php	95.96% <100.00%> (ø)
src/Propel/Generator/Model/Database.php	72.78% <100.00%> (ø)
src/Propel/Generator/Model/Domain.php	84.48% <100.00%> (ø)
src/Propel/Generator/Model/Index.php	97.84% <100.00%> (ø)
src/Propel/Generator/Platform/DefaultPlatform.php	94.60% <100.00%> (ø)
src/Propel/Generator/Platform/MysqlPlatform.php	95.69% <100.00%> (ø)
... and 7 more

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