[Webkit-unassigned] [Bug 187650] New: Number.toPrecision returns a wrong value

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187650

            Bug ID: 187650
           Summary: Number.toPrecision returns a wrong value
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: isol2 at cin.ufpe.br

Version: JavaScriptCore v233804
OS: Ubuntu 16.04 x64

Hi everyone,
I found an issue on a test case using Number.toPrecision that I don’t know if it is considered as an incompatibility issue between engines or a real bug example, but according with ES6 specs some values are described as "approximately" maybe this is a case of it. 
V8, JSC and SpiderMonkey returns the wrong value if param > 17, only Chakra works as expected.

Steps to reproduce:
print(123.56.toPrecision(18) === "123.560000000000000");
print(123.56.toPrecision(18))

Actual results:
False
123.560000000000002

Expected results:
True
123.560000000000000

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