Case mismatch on custom data date/boolean import leads to silent drop of entire record

When importing contacts, a custom field with select (also probably Multi-Select and ADVMulti-Select) is included and that field matches via case-insensitive match but does NOT match case-sensitive match, the entire record is silently dropped from the import without giving and error message.

This bug is similar to http://issues.civicrm.org/jira/browse/CRM-10832 and the cause appears to be similar. Looking at /CRM/Import/Parser/Contact.php:

1. There is a validation step and an import step. The validation step accepts case-insensitive matches but the import step rejects them (silently).

2. Errors on the import step ( are just ignored and not displayed or logged anywhere. This makes it difficult to troubleshoot errors that happen.

I think problem #1 can be fixed by removing the strtolower statements in this line of /CRM/Import/Parser/Contact.php (around line 1210):

if ((strtolower(trim($v2['label'])) == strtolower(trim($v1))) || (strtolower(trim($v2['value'])) == strtolower(trim($v1)))) {
$flag = TRUE;

Similarly around line 1227:

if ((strtolower(trim($v2['label'])) == strtolower(trim($value))) || (strtolower(trim($v2['value'])) == strtolower(trim($value))))

{ $flag = TRUE; }

(I haven't had a chance to try this or troubleshoot it, however-there are some other lines with strtolower in the file and some might be OK while others are not. On the import, custom data with case mismatch is skipped-I'm not sure what happens to other data with case mismatch.)