#366 Fix node-to-float conversion error if node's value is <= 0

[fktn-k]

This PR has fixed the error in converting a node's value into a native floating point value, as reported in the issue #366.
The root cause was that calling the std::min() function to get the minimum possible value of the target type: the function returns minimum possible positive normal value of a floating point value type, not the minimum possible negative value; the appropriate function to call is the std::lowest() for that purpose.
In short, the real cause was the library coudn't convert a node value whose value is a floating point value equal to/less than 0.
So, this PR has fixed the issue by replacing the calling of std::min() with std::lowest() on node-to-float conversions.

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Pull Request Test Coverage Report for Build 10437692959

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Change from base Build 10433126801:	0.0%
Covered Lines:	3971
Relevant Lines:	3971

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