The code:
var numbers = new int[] { 1, 2, 3 };IL for mono 2.10:
IL_0000: ldc.i4.3
IL_0001: newarr [mscorlib]System.Int32
IL_0006: dup
IL_0007: ldtoken field valuetype '<PrivateImplementationDetails>{de495e46-bf42-4605-a020-39ddddfe413c}'/'$ArrayType=12' '<PrivateImplementationDetails>{de495e46-bf42-4605-a020-39ddddfe413c}'::'$field-0'
IL_000c: call void class [mscorlib]System.Runtime.CompilerServices.RuntimeHelpers::InitializeArray(class [mscorlib]System.Array, valuetype [mscorlib]System.RuntimeFieldHandle)
IL_0011: stloc.0
// ...
.field assembly static valuetype '<PrivateImplementationDetails>{de495e46-bf42-4605-a020-39ddddfe413c}'/'$ArrayType=12' '$field-0' at D_00004000
// ...
.data D_00004000 = bytearray (
01 00 00 00 02 00 00 00 03 00 00 00) // size: 12
IL for mono 2.4:
IL_0000: ldc.i4.3
IL_0001: newarr [mscorlib]System.Int32
IL_0006: dup
IL_0007: ldc.i4.0
IL_0008: ldc.i4.1
IL_0009: stelem.i4
IL_000a: dup
IL_000b: ldc.i4.1
IL_000c: ldc.i4.2
IL_000d: stelem.i4
IL_000e: dup
IL_000f: ldc.i4.2
IL_0010: ldc.i4.3
IL_0011: stelem.i4
IL_0012: stloc.0