patches/usePool.patch

diff --git a/source/data/BUILDRULES.py b/source/data/BUILDRULES.py
index 2442f4e3..d9e8ac19 100644
--- a/source/data/BUILDRULES.py
+++ b/source/data/BUILDRULES.py
@@ -43,48 +43,49 @@ def generate(config, glob, common_vars):
         "locales",
         None,
         "icu-locale-deprecates.xml",
-        True,
+        config.use_pool_bundle,
         [])
 
     requests += generate_tree(config, glob, common_vars,
         "curr",
         "curr",
         "icu-locale-deprecates.xml",
-        True,
+        config.use_pool_bundle,
         [])
 
     requests += generate_tree(config, glob, common_vars,
         "lang",
         "lang",
         "icu-locale-deprecates.xml",
-        True,
+        config.use_pool_bundle,
         [])
 
     requests += generate_tree(config, glob, common_vars,
         "region",
         "region",
         "icu-locale-deprecates.xml",
-        True,
+        config.use_pool_bundle,
         [])
 
     requests += generate_tree(config, glob, common_vars,
         "zone",
         "zone",
         "icu-locale-deprecates.xml",
-        True,
+        config.use_pool_bundle,
         [])
 
     requests += generate_tree(config, glob, common_vars,
         "unit",
         "unit",
         "icu-locale-deprecates.xml",
-        True,
+        config.use_pool_bundle,
         [])
 
     requests += generate_tree(config, glob, common_vars,
         "coll",
         "coll",
         "icu-coll-deprecates.xml",
+        # Never use pool bundle for coll, brkitr, or rbnf
         False,
         # Depends on timezoneTypes.res and keyTypeData.res.
         # TODO: We should not need this dependency to build collation.
@@ -95,6 +96,7 @@ def generate(config, glob, common_vars):
         "brkitr",
         "brkitr",
         "icu-locale-deprecates.xml",
+        # Never use pool bundle for coll, brkitr, or rbnf
         False,
         [DepTarget("brkitr_brk"), DepTarget("dictionaries")])
 
@@ -102,6 +104,7 @@ def generate(config, glob, common_vars):
         "rbnf",
         "rbnf",
         "icu-rbnf-deprecates.xml",
+        # Never use pool bundle for coll, brkitr, or rbnf
         False,
         [])
 
diff --git a/source/data/buildtool/__main__.py b/source/data/buildtool/__main__.py
index 52d869c8..30cfcdc2 100644
--- a/source/data/buildtool/__main__.py
+++ b/source/data/buildtool/__main__.py
@@ -141,6 +141,11 @@ class Config(object):
         if "collationUCAData" in self.filters_json_data:
             self.coll_han_type = self.filters_json_data["collationUCAData"]
 
+        # True or False (could be extended later to support enum/list)
+        self.use_pool_bundle = True
+        if "usePoolBundle" in self.filters_json_data:
+            self.use_pool_bundle = self.filters_json_data["usePoolBundle"]
+
     def _parse_filter_file(self, f):
         # Use the Hjson parser if it is available; otherwise, use vanilla JSON.
         try:
diff --git a/source/data/buildtool/filtration_schema.json b/source/data/buildtool/filtration_schema.json
index 479c65af..c9f9b8cd 100644
--- a/source/data/buildtool/filtration_schema.json
+++ b/source/data/buildtool/filtration_schema.json
@@ -57,6 +57,9 @@
         "collationUCAData": {
             "type": "string",
             "enum": ["unihan", "implicithan"]
+	},
+        "usePoolBundle": {
+            "type": "boolean"
         }
     },
     "additionalProperties": false,