Chore: Renumber unreleased release from 3.7.0 to 3.6.12.

The pending TaxJar response-cache work is retargeted from the 3.7.0 minor
to the 3.6.x patch line. Update the unreleased changelog and readme
headings, and move the five @SInCE stamps on the new cache-normalization
helpers so they document the version that will actually ship.

Author: bartech

changelog.txt

@@ -14,14 +14,14 @@
 * Fix   - Calculate tax correctly for carts mixing taxable and non-taxable products, so a non-taxable product no longer resets the standard tax rate to zero.
 * Tweak - Centralize TaxJar address handling in an internal value object. No change to tax calculation.
 * Tweak - Store tax rate rows against the postcode the rate was quoted for when the address postcode holds more than one comma-separated value.
+* Tweak - Reduce redundant TaxJar API calls by matching cached tax responses across the cart and order paths and ignoring irrelevant formatting differences.
 
 = 3.6.11 - 2026-08-05 =
 * Fix   - Prevent a fatal error during cart and checkout tax calculation when TaxJar returns an incomplete tax response.
 * Fix   - React 19 compatibility for store notices on the block cart and checkout.
 
 = 3.6.10 - 2026-07-27 =
 * Tweak - WooCommerce 11.0 Compatibility.
-* Tweak - Reduce redundant TaxJar API calls by matching cached tax responses across the cart and order paths and ignoring irrelevant formatting differences.
 
 = 3.6.9 - 2026-07-20 =
 * Fix   - Prevent a rare fatal error when the WooCommerce Store API cannot be initialized on incomplete installations.

classes/class-wc-connect-taxjar-integration.php

@@ -1165,7 +1165,7 @@ protected function get_line_item( $id, $line_items ) {
 	 * identical lines — an order can legitimately hold the same product twice at the
 	 * same price — distinct, so neither loses its rate.
 	 *
-	 * @since 3.7.0
+	 * @since 3.6.12
 	 *
 	 * @param array $line_items Line items whose 'id' is currently the bare product ID.
 	 *
@@ -1207,7 +1207,7 @@ private function assign_canonical_line_item_ids( array $line_items ): array {
 	 * cache keys and line item fingerprints — never to build the request sent to
 	 * TaxJar, which keeps the merchant's values verbatim.
 	 *
-	 * @since 3.7.0
+	 * @since 3.6.12
 	 *
 	 * @param mixed $value Value to normalize.
 	 *
@@ -1237,7 +1237,7 @@ private function normalize_cache_string( $value ): string {
 	 * silently reinterpreted — notably ZIP codes, where "01234" must never become
 	 * "1234".
 	 *
-	 * @since 3.7.0
+	 * @since 3.6.12
 	 *
 	 * @param mixed $value Value to normalize.
 	 *
@@ -1274,7 +1274,7 @@ private function normalize_cache_number( $value ): string {
 	 *
 	 * Only the cache key is derived from this. The body sent to TaxJar is untouched.
 	 *
-	 * @since 3.7.0
+	 * @since 3.6.12
 	 *
 	 * @param string $json Encoded TaxJar request body.
 	 *
@@ -1297,7 +1297,7 @@ private function get_cache_signature( $json ): string {
 	 * value, because several address fields hold digit-only strings that must keep
 	 * their exact form (a leading-zero ZIP above all).
 	 *
-	 * @since 3.7.0
+	 * @since 3.6.12
 	 *
 	 * @param mixed  $value Value to canonicalize.
 	 * @param string $key   Key the value was found under.

readme.txt

@@ -84,14 +84,14 @@ This plugin relies on the following external services:
 * Fix   - Calculate tax correctly for carts mixing taxable and non-taxable products, so a non-taxable product no longer resets the standard tax rate to zero.
 * Tweak - Centralize TaxJar address handling in an internal value object. No change to tax calculation.
 * Tweak - Store tax rate rows against the postcode the rate was quoted for when the address postcode holds more than one comma-separated value.
+* Tweak - Reduce redundant TaxJar API calls by matching cached tax responses across the cart and order paths and ignoring irrelevant formatting differences.
 
 = 3.6.11 - 2026-08-05 =
 * Fix   - Prevent a fatal error during cart and checkout tax calculation when TaxJar returns an incomplete tax response.
 * Fix   - React 19 compatibility for store notices on the block cart and checkout.
 
 = 3.6.10 - 2026-07-27 =
 * Tweak - WooCommerce 11.0 Compatibility.
-* Tweak - Reduce redundant TaxJar API calls by matching cached tax responses across the cart and order paths and ignoring irrelevant formatting differences.
 
 = 3.6.9 - 2026-07-20 =
 * Fix   - Prevent a rare fatal error when the WooCommerce Store API cannot be initialized on incomplete installations.