Fix serialization of floating point numbers

diff --git a/builtin/common/serialize.lua b/builtin/common/serialize.lua
index 24b2a12ee3be9e2219ecdfbcf2f9393cf7710254..90b8b2ad6a6e40ab4a695e36e97f484b4579fd15 100644 (file)
--- a/builtin/common/serialize.lua
+++ b/builtin/common/serialize.lua
@@ -115,11 +115,20 @@ function core.serialize(x)
        function dump_val(x)
                local  tp = type(x)
                if     x  == nil        then return "nil"
-               elseif tp == "number"   then return string.format("%d", x)
                elseif tp == "string"   then return string.format("%q", x)
                elseif tp == "boolean"  then return x and "true" or "false"
                elseif tp == "function" then
                        return string.format("loadstring(%q)", string.dump(x))
+               elseif tp == "number"   then
+                       -- Serialize integers with string.format to prevent
+                       -- scientific notation, which doesn't preserve
+                       -- precision and breaks things like node position
+                       -- hashes.  Serialize floats normally.
+                       if math.floor(x) == x then
+                               return string.format("%d", x)
+                       else
+                               return tostring(x)
+                       end
                elseif tp == "table" then
                        local vals = {}
                        local idx_dumped = {}