Float field gets rounded to one decimal point on save

Any help on this would be much appreciated:

I have a custom node type with a field of the "Float" type. For some reason, the value of this field is automatically rounding to one decimal point when the node is saved. This is not good for me, as I need it to store the original floating point number with all decimal places intact.

Any ideas?

I first noticed this issue when working on a module that saves the node programatically, but I checked the standard edit node form and it, too, does the same thing (for instance, a field value of 1234.56 turns into 1234.5) once you click save and view the updated node.

If it matters to anyone, I wrote a short PHP snippet to check the value of the field in the node object just before node_save() was called, and I was able to confirm that the full floating point number is intact at that point. When I reload the node object after it has been saved, however, the value is now rounded:

<?php 
print "Original: ".$node->field_myfloat['und'][0]['value']."<BR>";
node_save($node);
$newnode=node_load($node->nid);
print "After Save: ".$newnode->field_myfloat['und'][0]['value'];
?>

Results in the following:

Original: 74173.59
After Save: 74173.6