[PR] VELOCITY-996 Fix precision loss in BigDecimal conversion [velocity-engine]

ogawaffm opened a new pull request, #65:
URL: https://github.com/apache/velocity-engine/pull/65

   ## Problem
   
   `MathUtils.toBigDecimal(Number)` currently converts generic `Number` instances through `doubleValue()` before creating a `BigDecimal`.
   
   This can lose precision for large integral values, for example `Long.MAX_VALUE`.
   
   As a result, VTL arithmetic and comparisons involving a `Long` and a `BigDecimal` may produce unexpected results.
   
   ## Example
   
   ```vtl
   #set($L  = 9223372036854775807)  ## Long.MAX_VALUE
   #set($BI = 9223372036854775808)  ## BigInteger
   
   #set($BD0 = ($BI + 0.0) - $BI)  ## BigDecimal 0.0
   #set($BDL = $BI - 1.0)          ## BigDecimal 9223372036854775807.0
   
   #set($d = $L + $BD0)
   L + BigDecimal(0.0)       = $d ($d.class.name)
   
   L == BigDecimal(Long.MAX) = #if($L == $BDL)true#{else}false#end
   L >  BigDecimal(Long.MAX) = #if($L >  $BDL)true#{else}false#end
   vtl```
   
   


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