Problem:
Change in the error code for the following query

db.s9.find( { "a" : "" } ).sort( { "d.1.a" : true } ).skip( 100 ).skip( 1 )

2.4.5

error: {
"$err" : "Ambiguous field name found in array (do not use numeric field names in embedded elements in an array), field: '1' for array: { 0: 1.0, 1: { 1: 0.0, d:

Unknown macro: { c}

}, 2: \"Do not seek to follow in the footsteps of the men of old; seek what they sought.\" }",
"code" : 15855
}

2.5.4-Pre

error: {
"$err" : "Ambiguous field name found in array (do not use numeric field names in embedded elements in an array), field: '1' for array: { 0: 1.0, 1: { 1: 0.0, d:

Unknown macro: { c}

}, 2: \"Do not seek to follow in the footsteps of the men of old; seek what they sought.\" }",
"code" : 16746
}