Correct definition of MultipleOf and ExclusiveMaximum.

[omissis]

• Correct definition of MultipleOf and ExclusiveMaximum. Both should be float64 according to http://json-schema.org/draft/2020-12/json-schema-validation.html#name-multipleof
• fix: set exclusiveMinimum to float64 as well

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (891d383) 78.14% compared to head (078ce88) 61.84%.
Report is 26 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #127       +/-   ##
===========================================
- Coverage   78.14%   61.84%   -16.30%     
===========================================
  Files          10       23       +13     
  Lines        1446     2034      +588     
===========================================
+ Hits         1130     1258      +128     
- Misses        244      692      +448     
- Partials       72       84       +12     

Files	Coverage Δ
pkg/schemas/model.go	61.42% <ø> (ø)

... and 16 files with indirect coverage changes

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[omissis]

Replaces #116 (just a rebased from main and added one missing type conversion)