JuliaMath / FixedPointDecimals.jl / 207

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Add "copy-constructor" to prevent (incorrect) convert call when type is the same (#36)

Before this change:
```
  julia> x = f = FixedDecimal{Int128,2}(3.25)
  >> FixedDecimal{Int128,2}(3.25)

  julia> @btime x = FixedDecimal{Int128, 2}($f)
    7.272 μs (159 allocations: 2.73 KiB)
  >> FixedDecimal{Int128,2}(3.25)
```

After this change:
```
  julia> x = f = FixedDecimal{Int128,2}(3.25)
  >> FixedDecimal{Int128,2}(3.25)

  julia> @btime x = FixedDecimal{Int128, 2}($f)
    1.508 ns (0 allocations: 0 bytes)
  >> FixedDecimal{Int128,2}(3.25)
```

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