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The third test of MSC.t is failing for me.

• Math-Int64-0.23
• ActivePerl build 1402
• Perl 5.14.2, 32 bit, threaded.
• Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 16.00.40219.01 for 80x86

t/MSC.t ................. 1/3
#   Failed test 'uint64 to NV conversion 3'
#   at t/MSC.t line 15.
# Looks like you failed 1 test of 3.
t/MSC.t ................. Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/3 subtests

t/MSC.t               (Wstat: 256 Tests: 3 Failed: 1)
  Failed test:  3
  Non-zero exit status: 1
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I changed the test from ok to is tests to get more info:

t/MSC.t ................. 1/3
#   Failed test 'uint64 to NV conversion 3'
#   at t/MSC.t line 15.
#          got: '1.83746864796716e+019'
#     expected: '18374686479671623680'
# Looks like you failed 1 test of 3.
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The thing is I can't see any different between the two by looking at them using sprintf or pack 'd'.

nv: 1.837468647967162400000000000000e+019
u:  1.837468647967162400000000000000e+019
nv: 43efe00000000000
u:  43efe00000000000
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The warnings I get:

Int64.xs(256) : warning C4244: 'return' : conversion from 'NV' to 'int
+64_t', possible loss of data
Int64.xs(335) : warning C4244: 'return' : conversion from 'NV' to 'uin
+t64_t', possible loss of data
Int64.xs(345) : warning C4244: 'initializing' : conversion from 'int64
+_t' to 'IV', possible loss of data
Int64.xs(350) : warning C4244: 'initializing' : conversion from 'int64
+_t' to 'UV', possible loss of data
Int64.xs(354) : warning C4244: 'function' : conversion from 'int64_t' 
+to 'const NV', possible loss of data
Int64.xs(360) : warning C4244: 'initializing' : conversion from 'uint6
+4_t' to 'UV', possible loss of data
Int64.xs(363) : warning C4244: 'function' : conversion from 'uint64_t'
+ to 'const NV', possible loss of data
Int64.xs(375) : warning C4244: 'initializing' : conversion from 'uint6
+4_t' to 'char', possible loss of data
Int64.xs(492) : warning C4244: 'function' : conversion from 'int64_t' 
+to 'const IV', possible loss of data
Int64.xs(516) : warning C4244: 'function' : conversion from 'uint64_t'
+ to 'const UV', possible loss of data
Int64.xs(535) : warning C4244: '=' : conversion from 'int64_t' to 'cha
+r', possible loss of data
Int64.xs(553) : warning C4244: '=' : conversion from 'uint64_t' to 'ch
+ar', possible loss of data
Int64.xs(669) : warning C4244: 'function' : conversion from 'uint64_t'
+ to 'const IV', possible loss of data
Int64.xs(680) : warning C4244: 'function' : conversion from 'uint64_t'
+ to 'const UV', possible loss of data
Int64.xs(690) : warning C4244: 'function' : conversion from 'uint64_t'
+ to 'const IV', possible loss of data
Int64.xs(700) : warning C4244: 'function' : conversion from 'uint64_t'
+ to 'const UV', possible loss of data
Int64.xs(712) : warning C4244: 'function' : conversion from 'int64_t' 
+to 'const IV', possible loss of data
Int64.xs(723) : warning C4244: 'function' : conversion from 'uint64_t'
+ to 'const IV', possible loss of data
Int64.c(1288) : warning C4101: 'rev' : unreferenced local variable
Int64.c(1287) : warning C4101: 'other' : unreferenced local variable
Int64.c(1317) : warning C4101: 'rev' : unreferenced local variable
Int64.c(1316) : warning C4101: 'other' : unreferenced local variable
Int64.c(1782) : warning C4101: 'rev' : unreferenced local variable
Int64.c(1811) : warning C4101: 'rev' : unreferenced local variable
Int64.c(2107) : warning C4101: 'rev' : unreferenced local variable
Int64.c(2106) : warning C4101: 'other' : unreferenced local variable
Int64.c(2133) : warning C4101: 'rev' : unreferenced local variable
Int64.c(2132) : warning C4101: 'other' : unreferenced local variable
Int64.c(2159) : warning C4101: 'rev' : unreferenced local variable
Int64.c(2158) : warning C4101: 'other' : unreferenced local variable
Int64.c(2185) : warning C4101: 'rev' : unreferenced local variable
Int64.c(2184) : warning C4101: 'other' : unreferenced local variable
Int64.c(2211) : warning C4101: 'rev' : unreferenced local variable
Int64.c(2210) : warning C4101: 'other' : unreferenced local variable
Int64.c(2237) : warning C4101: 'rev' : unreferenced local variable
Int64.c(2236) : warning C4101: 'other' : unreferenced local variable
Int64.c(2263) : warning C4101: 'rev' : unreferenced local variable
Int64.c(2262) : warning C4101: 'other' : unreferenced local variable
Int64.c(2289) : warning C4101: 'rev' : unreferenced local variable
Int64.c(2288) : warning C4101: 'other' : unreferenced local variable
Int64.c(2317) : warning C4101: 'rev' : unreferenced local variable
Int64.c(2316) : warning C4101: 'other' : unreferenced local variable
Int64.c(2763) : warning C4101: 'rev' : unreferenced local variable
Int64.c(2792) : warning C4101: 'rev' : unreferenced local variable
Int64.c(3088) : warning C4101: 'rev' : unreferenced local variable
Int64.c(3087) : warning C4101: 'other' : unreferenced local variable
Int64.c(3114) : warning C4101: 'rev' : unreferenced local variable
Int64.c(3113) : warning C4101: 'other' : unreferenced local variable
Int64.c(3140) : warning C4101: 'rev' : unreferenced local variable
Int64.c(3139) : warning C4101: 'other' : unreferenced local variable
Int64.c(3166) : warning C4101: 'rev' : unreferenced local variable
Int64.c(3165) : warning C4101: 'other' : unreferenced local variable
Int64.c(3192) : warning C4101: 'rev' : unreferenced local variable
Int64.c(3191) : warning C4101: 'other' : unreferenced local variable
Int64.c(3218) : warning C4101: 'rev' : unreferenced local variable
Int64.c(3217) : warning C4101: 'other' : unreferenced local variable
Int64.c(3244) : warning C4101: 'rev' : unreferenced local variable
Int64.c(3243) : warning C4101: 'other' : unreferenced local variable
...\int64.xs(170) : warning C4715: 'SvSI64' : not all control paths re
+turn a value
...\int64.xs(180) : warning C4715: 'SvSU64' : not all control paths re
+turn a value
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