manual_buffer_allocation: Added precision in error/warning messages

[francis-clairicia]

Relates to #253.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (d19fb53) to head (8178971).

Additional details and impacted files

Flag	Coverage Δ
OS-Linux	83.59% <42.85%> (-0.04%)	⬇️
OS-Windows	83.54% <42.85%> (-0.04%)	⬇️
OS-macOS	83.59% <42.85%> (-0.04%)	⬇️
Py-3.11	99.89% <100.00%> (+<0.01%)	⬆️
Py-3.12	99.92% <100.00%> (+<0.01%)	⬆️
test-functional	83.99% <42.85%> (-0.04%)	⬇️
test-unit	88.47% <100.00%> (+<0.01%)	⬆️

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