Why is CFTHREAD resuing local variable values in a loop?

When creating threads in a loop, it appears that each thread is overwriting the previous. Here is some pseudo code:

<cfscript>
LOCAL.Items=[
    "ABC",
    "DEF",
    "GHI",
    "JKL",
    "MNO",
    "PQR",
    "STU",
    "VWX",
    "YZ"];

for (LOCAL.item in LOCAL.Items) {
    writeoutput(LOCAL.item & "<br />");
}

for (LOCAL.item in LOCAL.Items) {
    thread name="items-#LOCAL.item#" action="run" {
        writelog(text=LOCAL.item, type="information", file="thread-test");
    }
}
</cfscript>

Output of first loop:

ABC
DEF
GHI
JKL
MNO
PQR
STU
VWX
YZ

(as expected)

Data in thread-test.log:

"Information","cfthread-23","03/11/24","13:18:40","MNO"
"Information","cfthread-28","03/11/24","13:18:40","YZ"
"Information","cfthread-23","03/11/24","13:18:40","YZ"
"Information","cfthread-28","03/11/24","13:18:40","YZ"
"Information","cfthread-23","03/11/24","13:18:40","YZ"
"Information","cfthread-28","03/11/24","13:18:40","YZ"
"Information","cfthread-23","03/11/24","13:18:40","YZ"
"Information","cfthread-28","03/11/24","13:18:40","YZ"
"Information","cfthread-23","03/11/24","13:18:40","YZ"

Shouldn't naming each thread uniquely create a unique thread and use the current value of LOCAL.item?

What am I missing here?

Solution

Did a little more poking around and found that cfthread/thread can accept custom attributes which can be accessed via the ATTRIBUTES scope. This seems to work:

for (LOCAL.item in LOCAL.Items) {
    thread name="items-#LOCAL.item#" action="run" item=LOCAL.item {
        writelog(text=ATTRIBUTES.item & "<br />", type="information", file="thread-test");
    }
}

Contents of thread-test.log:

"Information","cfthread-29","03/11/24","13:48:35","ABC" "Information","cfthread-31","03/11/24","13:48:35","GHI" "Information","cfthread-32","03/11/24","13:48:35","JKL" "Information","cfthread-30","03/11/24","13:48:35","DEF" "Information","cfthread-33","03/11/24","13:48:35","MNO" "Information","cfthread-33","03/11/24","13:48:35","STU" "Information","cfthread-32","03/11/24","13:48:35","YZ" "Information","cfthread-34","03/11/24","13:48:35","PQR" "Information","cfthread-30","03/11/24","13:48:35","VWX"