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Implement Is between functionality #320

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FIX Add functionality to compare if a decimal value is between two decimals #319

FIX Add functionality to compare if a decimal value is between two decimals shopspring#319
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Sorry for the late review and thanks a lot for your contribution!

@@ -900,12 +895,18 @@ func (d Decimal) LessThanOrEqual(d2 Decimal) bool {
return cmp == -1 || cmp == 0
}

// Betwee (LTE) return true when d is between d1 and d2 inclusive
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Go doc should start with the method name, so I'd suggest:
IsBetween returns true when d is between (inclusive) d1 and d2, otherwise false.

@@ -2542,6 +2542,13 @@ func TestDecimal_Equalities(t *testing.T) {
if c.LessThanOrEqual(b) {
t.Errorf("%q should not be less than or equal %q", a, b)
}

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Could you add a separate test case for IsBetween where you verify the correctness of left and right bound inclusiveness?

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