[issue1780] Decimal constructor accepts newline terminated strings

[Facundo Batista]

Facundo Batista added the comment:

I think that the Spec disallows additional whitespace to not allow, for
example, "2. 34" as "2.34", or "10 e-12".

I don't see any harm in having "  2.34" or "5.73\n" as good input
values, as long we remove those characters at both ends.

I propose to just make a .strip() at the input string, change the
documentation to reflect this, and that's all.

The doc says: "If value is a string, it should conform to the decimal
numeric string syntax:"

We can put: "If value is a string, it should conform to the decimal
numeric string syntax after being stripped on both ends:"

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<http://bugs.python.org/issue1780>
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