• Compiler Used: Xcode 9
• Operating System: macOS 10.12.6
• Architecture (ARM/x86/32bit/64bit/etc): x64

Expected Behavior

from_json("35.2e-2") should give 0.352, but gives 35.2.

Actual Behavior

When there is a negative exponent on a JSON-parsed number, it always returns the exponent 0, because parse_num doesn't support negative numbers. The solution will be to fix only the JSON parsing code, because it's too risky to touch the low-level ChaiScript number parsing! (I tried once before ;-)

Minimal Example to Reproduce Behavior

// These all fail as unit tests
assert_equal(from_json("9.9e-02"), 9.9e-02)
assert_equal(from_json("1E-01"), 0.1)
assert_equal(from_json("-314159e-5"), -3.14159)