Fixes for testing in non standard architectures

[j-rivero]

🦟 Bug fix

Summary

Fixes for tests in non x32 arches:

• Handle non i386/amd4 arches in PI precission
• Avoid to use zero as some arches return negative zero in str

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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[codecov]

Codecov Report

Merging #546 (2187d38) into ign-math6 (469540c) will not change coverage.
The diff coverage is n/a.

❗ Current head 2187d38 differs from pull request most recent head c83702c. Consider uploading reports for the commit c83702c to get more accurate results

@@            Coverage Diff             @@
##           ign-math6     #546   +/-   ##
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  Coverage      99.38%   99.38%           
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  Files             75       75           
  Lines           7029     7029           
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  Hits            6986     6986           
  Misses            43       43